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    svg {
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    .shell {
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      stroke: #cbd5e1;
      stroke-width: 1.5;
      stroke-dasharray: 3 3;
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    .outer-shell {
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      stroke-width: 2;
      stroke-dasharray: none;
      filter: drop-shadow(0 0 3px rgba(16, 185, 129, 0.4));
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    .nucleus {
      fill: #1e2945;
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    .nucleus-label {
      fill: #ffffff;
      font-size: 13px;
      font-weight: 700;
      text-anchor: middle;
      dominant-baseline: central;
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    .electron {
      fill: #0284c7;
      transition: transform 0.3s ease;
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      border: 1px solid #6ee7b7;
      padding: 3px 8px;
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      font-size: 12px;
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      .badge { font-size: 9.5px; padding: 2px 5px; }
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  </style>
</head>
<body>

  <div class="grid">
    
    <div class="atom-card active" onclick="selectCard(this)">
      <div class="atom-title">Helium (He)</div>
      <div class="config-code">2</div>
      <div class="svg-container">
        <svg viewBox="0 0 160 160">
          
          <circle cx="80" cy="80" r="50" class="shell outer-shell" />
          
          <circle cx="80" cy="80" r="18" class="nucleus" />
          <text x="80" y="80" class="nucleus-label">He</text>
          
          <circle cx="80" cy="30" r="4.5" class="valence-electron" />
          <circle cx="80" cy="130" r="4.5" class="valence-electron" />
        </svg>
      </div>
      <div class="badge">
        <span class="badge-icon">✓</span> Full 1st Shell
      </div>
    </div>

    
    <div class="atom-card" onclick="selectCard(this)">
      <div class="atom-title">Neon (Ne)</div>
      <div class="config-code">2, 8</div>
      <div class="svg-container">
        <svg viewBox="0 0 160 160">
          
          <circle cx="80" cy="80" r="34" class="shell" />
          
          <circle cx="80" cy="80" r="62" class="shell outer-shell" />
          
          <circle cx="80" cy="80" r="18" class="nucleus" />
          <text x="80" y="80" class="nucleus-label">Ne</text>
          
          
          <circle cx="80" cy="46" r="3.5" class="electron" />
          <circle cx="80" cy="114" r="3.5" class="electron" />

          
          
          <circle cx="73" cy="18.5" r="4" class="valence-electron" />
          <circle cx="87" cy="18.5" r="4" class="valence-electron" />
          
          <circle cx="73" cy="141.5" r="4" class="valence-electron" />
          <circle cx="87" cy="141.5" r="4" class="valence-electron" />
          
          <circle cx="18.5" cy="73" r="4" class="valence-electron" />
          <circle cx="18.5" cy="87" r="4" class="valence-electron" />
          
          <circle cx="141.5" cy="73" r="4" class="valence-electron" />
          <circle cx="141.5" cy="87" r="4" class="valence-electron" />
        </svg>
      </div>
      <div class="badge">
        <span class="badge-icon">✓</span> Full 2nd Shell
      </div>
    </div>

    
    <div class="atom-card" onclick="selectCard(this)">
      <div class="atom-title">Argon (Ar)</div>
      <div class="config-code">2, 8, 8</div>
      <div class="svg-container">
        <svg viewBox="0 0 160 160">
          
          <circle cx="80" cy="80" r="26" class="shell" />
          
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          <circle cx="80" cy="80" r="68" class="shell outer-shell" />
          
          <circle cx="80" cy="80" r="16" class="nucleus" />
          <text x="80" y="80" class="nucleus-label" style="font-size:12px;">Ar</text>

          
          <circle cx="80" cy="54" r="3" class="electron" />
          <circle cx="80" cy="106" r="3" class="electron" />

          
          <circle cx="74" cy="33.5" r="3" class="electron" />
          <circle cx="86" cy="33.5" r="3" class="electron" />
          <circle cx="74" cy="126.5" r="3" class="electron" />
          <circle cx="86" cy="126.5" r="3" class="electron" />
          <circle cx="33.5" cy="74" r="3" class="electron" />
          <circle cx="33.5" cy="86" r="3" class="electron" />
          <circle cx="126.5" cy="74" r="3" class="electron" />
          <circle cx="126.5" cy="86" r="3" class="electron" />

          
          
          <circle cx="73" cy="12.5" r="4" class="valence-electron" />
          <circle cx="87" cy="12.5" r="4" class="valence-electron" />
          
          <circle cx="73" cy="147.5" r="4" class="valence-electron" />
          <circle cx="87" cy="147.5" r="4" class="valence-electron" />
          
          <circle cx="12.5" cy="73" r="4" class="valence-electron" />
          <circle cx="12.5" cy="87" r="4" class="valence-electron" />
          
          <circle cx="147.5" cy="73" r="4" class="valence-electron" />
          <circle cx="147.5" cy="87" r="4" class="valence-electron" />
        </svg>
      </div>
      <div class="badge">
        <span class="badge-icon">✓</span> Full 3rd Shell
      </div>
    </div>
  </div>

  <script>
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</body>
</html>

Group 0 Noble Gases: Properties and Unreactivity

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <meta name="aspect-ratio" content="4:3">
  <title>Group 0 Trends: Noble Gases</title>
  <style>
    * { box-sizing: border-box; margin: 0; padding: 0; }
    body {
      font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
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      background: #ffffff;
      padding: 8px;
      user-select: none;
      -webkit-user-select: none;
    }
    .header {
      display: flex;
      justify-content: space-between;
      align-items: center;
      margin-bottom: 8px;
      flex-wrap: wrap;
      gap: 6px;
    }
    .title {
      font-size: 14px;
      font-weight: 700;
      color: #0f172a;
      display: flex;
      align-items: center;
      gap: 6px;
    }
    .tag {
      background: #e0e7ff;
      color: #3730a3;
      padding: 2px 6px;
      border-radius: 4px;
      font-size: 11px;
      font-weight: 600;
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    .toggle-btn {
      background: #f1f5f9;
      border: 1px solid #cbd5e1;
      color: #334155;
      padding: 4px 8px;
      border-radius: 6px;
      font-size: 12px;
      font-weight: 600;
      cursor: pointer;
      display: flex;
      align-items: center;
      gap: 4px;
      transition: all 0.2s ease;
    }
    .toggle-btn.active {
      background: #4f46e5;
      color: #ffffff;
      border-color: #4338ca;
    }
    .main-grid {
      display: grid;
      grid-template-columns: 1fr 140px;
      gap: 8px;
      position: relative;
    }
    @media (max-width: 460px) {
      .main-grid {
        grid-template-columns: 1fr 105px;
      }
    }

    /* Left Stack: Element Cards */
    .elements-col {
      display: flex;
      flex-direction: column;
      gap: 4px;
    }
    .element-card {
      display: flex;
      align-items: center;
      background: #f8fafc;
      border: 1px solid #e2e8f0;
      border-radius: 8px;
      padding: 4px 8px;
      position: relative;
      cursor: pointer;
      transition: all 0.2s ease;
      min-height: 48px;
    }
    .element-card:hover, .element-card.active {
      background: #eef2ff;
      border-color: #818cf8;
      box-shadow: 0 2px 6px rgba(99, 102, 241, 0.15);
    }
    .symbol-badge {
      width: 32px;
      height: 32px;
      border-radius: 6px;
      background: #6366f1;
      color: #ffffff;
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      line-height: 1;
      flex-shrink: 0;
    }
    .symbol-badge .z {
      font-size: 8px;
      opacity: 0.85;
      font-weight: 500;
    }
    .symbol-badge .sym {
      font-size: 13px;
    }
    .atom-viz {
      flex: 1;
      display: flex;
      align-items: center;
      justify-content: center;
      padding: 0 4px;
      position: relative;
      height: 40px;
    }
    .bp-badge {
      font-size: 11px;
      font-weight: 700;
      color: #0f172a;
      background: #e2e8f0;
      padding: 3px 6px;
      border-radius: 5px;
      white-space: nowrap;
      text-align: right;
      min-width: 58px;
      font-variant-numeric: tabular-nums;
      transition: all 0.2s ease;
    }
    .element-card:hover .bp-badge, .element-card.active .bp-badge {
      background: #4f46e5;
      color: #ffffff;
    }

    /* Right Column: Scale & Trend */
    .trends-col {
      display: flex;
      flex-direction: column;
      gap: 6px;
      background: #f8fafc;
      border: 1px solid #e2e8f0;
      border-radius: 8px;
      padding: 6px;
    }
    .trend-arrow-container {
      display: flex;
      flex-direction: column;
      align-items: center;
      gap: 4px;
      flex: 1;
    }
    .trend-label {
      font-size: 10px;
      font-weight: 700;
      text-transform: uppercase;
      letter-spacing: 0.5px;
      color: #475569;
      text-align: center;
      line-height: 1.2;
    }
    .scale-bar-wrapper {
      display: flex;
      width: 100%;
      flex: 1;
      gap: 6px;
      align-items: stretch;
      margin: 4px 0;
      position: relative;
    }
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      position: relative;
    }
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      position: absolute;
      left: -2px;
      width: 16px;
      height: 4px;
      background: #0f172a;
      border-radius: 2px;
      transition: top 0.25s ease;
      box-shadow: 0 0 4px rgba(0,0,0,0.5);
    }
    .scale-ticks {
      display: flex;
      flex-direction: column;
      justify-content: space-between;
      font-size: 10px;
      font-weight: 600;
      color: #64748b;
      line-height: 1;
      padding: 2px 0;
    }
    .scale-ticks .warm {
      color: #e11d48;
    }
    .scale-ticks .cold {
      color: #0284c7;
    }

    /* Chain pills */
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      margin-top: 6px;
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 4px;
    }
    @media (max-width: 500px) {
      .reason-box {
        grid-template-columns: repeat(2, 1fr);
      }
    }
    .reason-pill {
      background: #f1f5f9;
      border: 1px solid #e2e8f0;
      border-radius: 6px;
      padding: 4px 6px;
      font-size: 10px;
      color: #334155;
      line-height: 1.2;
      display: flex;
      gap: 4px;
      align-items: flex-start;
    }
    .reason-pill strong {
      color: #4f46e5;
      font-size: 11px;
    }
    .reason-pill.active {
      background: #eef2ff;
      border-color: #a5b4fc;
      color: #1e1b4b;
    }

    /* Force lines animation */
    .force-line {
      stroke: #f43f5e;
      stroke-dasharray: 2, 2;
      animation: pulse 1s infinite alternate;
    }
    @keyframes pulse {
      from { opacity: 0.3; }
      to { opacity: 1; }
    }
  </style>
</head>
<body>

  <div class="header">
    <div class="title">
      <span>Group 0 Trends</span>
      <span class="tag">Noble Gases</span>
    </div>
    <button id="toggleForces" class="toggle-btn" onclick="toggleAttraction()">
      <span id="forceIcon">⚡</span>
      <span>Intermolecular Forces</span>
    </button>
  </div>

  <div class="main-grid">
    
    <div class="elements-col">
      
      <div class="element-card" onmouseenter="highlight(0)" onclick="highlight(0)" data-bp="-269" data-pos="95">
        <div class="symbol-badge">
          <span class="z">2</span>
          <span class="sym">He</span>
        </div>
        <div class="atom-viz">
          <svg width="100%" height="36" viewBox="0 0 160 36">
            <g transform="translate(80, 18)">
              <circle r="7" fill="none" stroke="#94a3b8" stroke-width="1.2" />
              <circle r="3" fill="#6366f1" />
              
              <circle cx="0" cy="-7" r="1.5" fill="#3b82f6" />
              <circle cx="0" cy="7" r="1.5" fill="#3b82f6" />
            </g>
            
            <g class="force-pair" opacity="0" transform="translate(80, 18)">
              <line x1="-30" y1="0" x2="30" y2="0" class="force-line" stroke-width="1" />
              <g transform="translate(-40, 0)"><circle r="7" fill="none" stroke="#cbd5e1"/><circle r="3" fill="#94a3b8"/></g>
              <g transform="translate(40, 0)"><circle r="7" fill="none" stroke="#cbd5e1"/><circle r="3" fill="#94a3b8"/></g>
              <text x="0" y="-8" font-size="8" fill="#e11d48" font-weight="bold" text-anchor="middle">Very Weak</text>
            </g>
          </svg>
        </div>
        <div class="bp-badge">-269 °C</div>
      </div>

      
      <div class="element-card" onmouseenter="highlight(1)" onclick="highlight(1)" data-bp="-246" data-pos="84">
        <div class="symbol-badge">
          <span class="z">10</span>
          <span class="sym">Ne</span>
        </div>
        <div class="atom-viz">
          <svg width="100%" height="36" viewBox="0 0 160 36">
            <g transform="translate(80, 18)">
              <circle r="5" fill="none" stroke="#cbd5e1" stroke-width="1" />
              <circle r="10" fill="none" stroke="#94a3b8" stroke-width="1.2" />
              <circle r="3.5" fill="#6366f1" />
            </g>
            <g class="force-pair" opacity="0" transform="translate(80, 18)">
              <line x1="-30" y1="0" x2="30" y2="0" class="force-line" stroke-width="1.2" />
              <g transform="translate(-40, 0)"><circle r="10" fill="none" stroke="#cbd5e1"/><circle r="3" fill="#94a3b8"/></g>
              <g transform="translate(40, 0)"><circle r="10" fill="none" stroke="#cbd5e1"/><circle r="3" fill="#94a3b8"/></g>
            </g>
          </svg>
        </div>
        <div class="bp-badge">-246 °C</div>
      </div>

      
      <div class="element-card" onmouseenter="highlight(2)" onclick="highlight(2)" data-bp="-186" data-pos="56">
        <div class="symbol-badge">
          <span class="z">18</span>
          <span class="sym">Ar</span>
        </div>
        <div class="atom-viz">
          <svg width="100%" height="36" viewBox="0 0 160 36">
            <g transform="translate(80, 18)">
              <circle r="5" fill="none" stroke="#e2e8f0" stroke-width="1" />
              <circle r="9" fill="none" stroke="#cbd5e1" stroke-width="1" />
              <circle r="13" fill="none" stroke="#94a3b8" stroke-width="1.2" />
              <circle r="4" fill="#6366f1" />
            </g>
            <g class="force-pair" opacity="0" transform="translate(80, 18)">
              <line x1="-28" y1="0" x2="28" y2="0" class="force-line" stroke-width="1.8" />
              <g transform="translate(-42, 0)"><circle r="13" fill="none" stroke="#cbd5e1"/><circle r="3" fill="#94a3b8"/></g>
              <g transform="translate(42, 0)"><circle r="13" fill="none" stroke="#cbd5e1"/><circle r="3" fill="#94a3b8"/></g>
            </g>
          </svg>
        </div>
        <div class="bp-badge">-186 °C</div>
      </div>

      
      <div class="element-card" onmouseenter="highlight(3)" onclick="highlight(3)" data-bp="-153" data-pos="41">
        <div class="symbol-badge">
          <span class="z">36</span>
          <span class="sym">Kr</span>
        </div>
        <div class="atom-viz">
          <svg width="100%" height="36" viewBox="0 0 160 36">
            <g transform="translate(80, 18)">
              <circle r="4" fill="none" stroke="#e2e8f0" stroke-width="0.8" />
              <circle r="8" fill="none" stroke="#e2e8f0" stroke-width="0.8" />
              <circle r="12" fill="none" stroke="#cbd5e1" stroke-width="1" />
              <circle r="16" fill="none" stroke="#94a3b8" stroke-width="1.2" />
              <circle r="4" fill="#6366f1" />
            </g>
            <g class="force-pair" opacity="0" transform="translate(80, 18)">
              <line x1="-26" y1="0" x2="26" y2="0" class="force-line" stroke-width="2.3" />
              <g transform="translate(-44, 0)"><circle r="16" fill="none" stroke="#cbd5e1"/><circle r="3" fill="#94a3b8"/></g>
              <g transform="translate(44, 0)"><circle r="16" fill="none" stroke="#cbd5e1"/><circle r="3" fill="#94a3b8"/></g>
            </g>
          </svg>
        </div>
        <div class="bp-badge">-153 °C</div>
      </div>

      
      <div class="element-card" onmouseenter="highlight(4)" onclick="highlight(4)" data-bp="-108" data-pos="20">
        <div class="symbol-badge">
          <span class="z">54</span>
          <span class="sym">Xe</span>
        </div>
        <div class="atom-viz">
          <svg width="100%" height="36" viewBox="0 0 160 36">
            <g transform="translate(80, 18)">
              <circle r="5" fill="none" stroke="#e2e8f0" stroke-width="0.8" />
              <circle r="9" fill="none" stroke="#e2e8f0" stroke-width="0.8" />
              <circle r="13" fill="none" stroke="#cbd5e1" stroke-width="0.9" />
              <circle r="17" fill="none" stroke="#94a3b8" stroke-width="1.2" />
              <circle r="4.5" fill="#6366f1" />
            </g>
            <g class="force-pair" opacity="0" transform="translate(80, 18)">
              <line x1="-24" y1="0" x2="24" y2="0" class="force-line" stroke-width="3" />
              <g transform="translate(-46, 0)"><circle r="17" fill="none" stroke="#cbd5e1"/><circle r="3" fill="#94a3b8"/></g>
              <g transform="translate(46, 0)"><circle r="17" fill="none" stroke="#cbd5e1"/><circle r="3" fill="#94a3b8"/></g>
            </g>
          </svg>
        </div>
        <div class="bp-badge">-108 °C</div>
      </div>

      
      <div class="element-card" onmouseenter="highlight(5)" onclick="highlight(5)" data-bp="-62" data-pos="2">
        <div class="symbol-badge">
          <span class="z">86</span>
          <span class="sym">Rn</span>
        </div>
        <div class="atom-viz">
          <svg width="100%" height="36" viewBox="0 0 160 36">
            <g transform="translate(80, 18)">
              <circle r="4" fill="none" stroke="#e2e8f0" stroke-width="0.7" />
              <circle r="7" fill="none" stroke="#e2e8f0" stroke-width="0.7" />
              <circle r="11" fill="none" stroke="#e2e8f0" stroke-width="0.8" />
              <circle r="14.5" fill="none" stroke="#cbd5e1" stroke-width="0.9" />
              <circle r="18" fill="none" stroke="#94a3b8" stroke-width="1.2" />
              <circle r="5" fill="#6366f1" />
            </g>
            <g class="force-pair" opacity="0" transform="translate(80, 18)">
              <line x1="-22" y1="0" x2="22" y2="0" class="force-line" stroke-width="4" />
              <g transform="translate(-48, 0)"><circle r="18" fill="none" stroke="#cbd5e1"/><circle r="3" fill="#94a3b8"/></g>
              <g transform="translate(48, 0)"><circle r="18" fill="none" stroke="#cbd5e1"/><circle r="3" fill="#94a3b8"/></g>
              <text x="0" y="-8" font-size="8" fill="#e11d48" font-weight="bold" text-anchor="middle">Strongest</text>
            </g>
          </svg>
        </div>
        <div class="bp-badge">-62 °C</div>
      </div>
    </div>

    
    <div class="trends-col">
      <div class="trend-label">Boiling Point Trend</div>
      <div class="scale-bar-wrapper">
        <div class="scale-track">
          <div id="scaleMarker" class="scale-marker" style="top: 95%;"></div>
        </div>
        <div class="scale-ticks">
          <span class="warm">Higher (-62°C)</span>
          <span>-150°C</span>
          <span class="cold">Lower (-269°C)</span>
        </div>
      </div>
      <div class="trend-label" style="color: #6366f1; border-top: 1px solid #e2e8f0; padding-top: 4px;">
        ↓ Larger Atoms<br>↓ Stronger Forces<br>↓ Higher BP
      </div>
    </div>
  </div>

  
  <div class="reason-box">
    <div class="reason-pill" id="step1">
      <strong>1</strong> Larger atoms & more shells down group
    </div>
    <div class="reason-pill" id="step2">
      <strong>2</strong> More electrons = stronger attraction
    </div>
    <div class="reason-pill" id="step3">
      <strong>3</strong> More energy needed to separate
    </div>
    <div class="reason-pill" id="step4">
      <strong>4</strong> Boiling point increases (gets less negative)
    </div>
  </div>

  <script>
    let showForces = false;
    const cards = document.querySelectorAll('.element-card');
    const marker = document.getElementById('scaleMarker');
    const pills = [
      document.getElementById('step1'),
      document.getElementById('step2'),
      document.getElementById('step3'),
      document.getElementById('step4')
    ];

    function highlight(index) {
      cards.forEach((card, i) => {
        if (i === index) {
          card.classList.add('active');
          const pos = card.getAttribute('data-pos');
          marker.style.top = Math.max(2, Math.min(95, pos)) + '%';
        } else {
          card.classList.remove('active');
        }
      });

      // Highlight step sequence
      pills.forEach((p, idx) => {
        p.classList.toggle('active', idx <= Math.min(3, Math.floor(index * 4 / 6)));
      });
    }

    function toggleAttraction() {
      showForces = !showForces;
      const btn = document.getElementById('toggleForces');
      btn.classList.toggle('active', showForces);
      
      const normalAtoms = document.querySelectorAll('.atom-viz svg > g:first-child');
      const forcePairs = document.querySelectorAll('.force-pair');

      normalAtoms.forEach(el => {
        el.style.opacity = showForces ? '0' : '1';
        el.style.transition = 'opacity 0.2s ease';
      });

      forcePairs.forEach(el => {
        el.style.opacity = showForces ? '1' : '0';
        el.style.transition = 'opacity 0.2s ease';
      });
    }

    // Default select Helium
    highlight(0);
  </script>
</body>
</html>

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <meta name="aspect-ratio" content="1:1">
  <title>Diatomic vs Monatomic Noble Gases</title>
  <style>
    * { box-sizing: border-box; margin: 0; padding: 0; }
    body {
      font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
      color: #1e2945;
      background: #ffffff;
      padding: 12px;
      display: flex;
      flex-direction: column;
      gap: 12px;
      user-select: none;
    }
    
    .chambers-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 10px;
      width: 100%;
    }

    .chamber-card {
      background: #f8fafc;
      border: 1.5px solid #e2e8f0;
      border-radius: 12px;
      padding: 8px;
      display: flex;
      flex-direction: column;
      align-items: center;
      gap: 6px;
    }

    .chamber-header {
      font-size: 13px;
      font-weight: 700;
      text-align: center;
      line-height: 1.2;
      color: #1e2945;
    }

    .chamber-sub {
      font-size: 11px;
      font-weight: 600;
      color: #64748b;
    }

    .canvas-box {
      width: 100%;
      height: 160px;
      background: #0f172a;
      border-radius: 8px;
      position: relative;
      overflow: hidden;
      box-shadow: inset 0 2px 8px rgba(0,0,0,0.4);
    }

    canvas {
      width: 100%;
      height: 100%;
      display: block;
    }

    .elements-section {
      background: #f8fafc;
      border: 1.5px solid #e2e8f0;
      border-radius: 12px;
      padding: 10px 12px;
      display: flex;
      flex-direction: column;
      gap: 8px;
    }

    .section-title {
      font-size: 12px;
      font-weight: 700;
      text-transform: uppercase;
      letter-spacing: 0.5px;
      color: #64748b;
      display: flex;
      justify-content: space-between;
      align-items: center;
    }

    .pill-grid {
      display: grid;
      grid-template-columns: repeat(6, 1fr);
      gap: 6px;
    }

    .pill {
      background: #ffffff;
      border: 1.5px solid #e2e8f0;
      border-radius: 8px;
      padding: 6px 2px;
      text-align: center;
      cursor: pointer;
      transition: border-color 0.2s, box-shadow 0.2s, background-color 0.2s;
    }

    .pill:hover {
      border-color: #00e5ff;
    }

    .pill.active {
      background: #ecfeff;
      border-color: #06b6d4;
      box-shadow: 0 0 10px rgba(6, 182, 212, 0.35);
    }

    .pill-sym {
      font-size: 14px;
      font-weight: 800;
      color: #0f172a;
      line-height: 1;
    }

    .pill-num {
      font-size: 10px;
      font-weight: 600;
      color: #64748b;
      margin-top: 2px;
    }

    .info-bar {
      font-size: 12px;
      font-weight: 600;
      color: #334155;
      text-align: center;
      background: #ffffff;
      border-radius: 6px;
      padding: 6px;
      border: 1px solid #e2e8f0;
    }

    @media (max-width: 360px) {
      .pill-grid {
        grid-template-columns: repeat(3, 1fr);
      }
      .canvas-box {
        height: 130px;
      }
    }
  </style>
</head>
<body>

  <div class="chambers-grid">
    
    <div class="chamber-card">
      <div class="chamber-header">
        Diatomic Gas<br>
        <span class="chamber-sub">Pairs (e.g. O₂)</span>
      </div>
      <div class="canvas-box">
        <canvas id="diatomicCanvas"></canvas>
      </div>
    </div>

    
    <div class="chamber-card">
      <div class="chamber-header">
        Group 0 Gas<br>
        <span class="chamber-sub" id="nobleSub">Single Atoms (Ne)</span>
      </div>
      <div class="canvas-box">
        <canvas id="nobleCanvas"></canvas>
      </div>
    </div>
  </div>

  <div class="elements-section">
    <div class="section-title">
      <span>Group 0 Elements (Noble Gases)</span>
      <span style="font-size:10px; color:#0284c7;">Tap element</span>
    </div>
    <div class="pill-grid" id="pillGrid">
      <div class="pill" data-sym="He" data-name="Helium" data-num="2" data-color="#fef08a">
        <div class="pill-sym">He</div>
        <div class="pill-num">2</div>
      </div>
      <div class="pill active" data-sym="Ne" data-name="Neon" data-num="10" data-color="#00e5ff">
        <div class="pill-sym">Ne</div>
        <div class="pill-num">10</div>
      </div>
      <div class="pill" data-sym="Ar" data-name="Argon" data-num="18" data-color="#c084fc">
        <div class="pill-sym">Ar</div>
        <div class="pill-num">18</div>
      </div>
      <div class="pill" data-sym="Kr" data-name="Krypton" data-num="36" data-color="#93c5fd">
        <div class="pill-sym">Kr</div>
        <div class="pill-num">36</div>
      </div>
      <div class="pill" data-sym="Xe" data-name="Xenon" data-num="54" data-color="#38bdf8">
        <div class="pill-sym">Xe</div>
        <div class="pill-num">54</div>
      </div>
      <div class="pill" data-sym="Rn" data-name="Radon" data-num="86" data-color="#4ade80">
        <div class="pill-sym">Rn</div>
        <div class="pill-num">86</div>
      </div>
    </div>
    <div class="info-bar" id="infoBar">
      Single atoms (monatomic) · Full outer shell = completely unreactive
    </div>
  </div>

  <script>
    // Diatomic pairs simulation
    const diaCanvas = document.getElementById('diatomicCanvas');
    const diaCtx = diaCanvas.getContext('2d');
    const nobleCanvas = document.getElementById('nobleCanvas');
    const nobleCtx = nobleCanvas.getContext('2d');
    const nobleSub = document.getElementById('nobleSub');
    const infoBar = document.getElementById('infoBar');

    let currentAtom = {
      sym: 'Ne',
      name: 'Neon',
      num: 10,
      color: '#00e5ff'
    };

    function resize() {
      const dpr = window.devicePixelRatio || 1;
      [diaCanvas, nobleCanvas].forEach(c => {
        const rect = c.parentElement.getBoundingClientRect();
        c.width = rect.width * dpr;
        c.height = rect.height * dpr;
      });
      diaCtx.scale(dpr, dpr);
      nobleCtx.scale(dpr, dpr);
    }

    // Diatomic molecules (pairs connected by covalent bond)
    const pairs = [
      { x: 30, y: 40, vx: 0.6, vy: 0.5, angle: 0.2, va: 0.02 },
      { x: 100, y: 110, vx: -0.5, vy: 0.7, angle: 1.1, va: -0.015 },
      { x: 120, y: 35, vx: -0.4, vy: -0.6, angle: 2.3, va: 0.01 },
      { x: 50, y: 120, vx: 0.7, vy: -0.4, angle: 0.8, va: -0.02 }
    ];

    // Monatomic atoms (single floating spheres)
    const singles = [
      { x: 25, y: 35, vx: 0.7, vy: 0.5 },
      { x: 75, y: 25, vx: -0.6, vy: 0.8 },
      { x: 120, y: 55, vx: -0.5, vy: -0.6 },
      { x: 35, y: 95, vx: 0.8, vy: -0.5 },
      { x: 85, y: 80, vx: 0.5, vy: 0.7 },
      { x: 125, y: 125, vx: -0.7, vy: 0.4 },
      { x: 45, y: 140, vx: -0.6, vy: -0.7 },
      { x: 95, y: 135, vx: 0.6, vy: -0.6 }
    ];

    function updateAndDraw() {
      const w = diaCanvas.parentElement.clientWidth;
      const h = diaCanvas.parentElement.clientHeight;

      // --- Draw Diatomic Chamber ---
      diaCtx.clearRect(0, 0, w, h);
      const r = 8;
      const bondDist = 12;

      pairs.forEach(p => {
        p.x += p.vx;
        p.y += p.vy;
        p.angle += p.va;

        const bound = bondDist + r;
        if (p.x < bound) { p.x = bound; p.vx *= -1; }
        if (p.x > w - bound) { p.x = w - bound; p.vx *= -1; }
        if (p.y < bound) { p.y = bound; p.vy *= -1; }
        if (p.y > h - bound) { p.y = h - bound; p.vy *= -1; }

        const cos = Math.cos(p.angle);
        const sin = Math.sin(p.angle);

        const x1 = p.x - cos * (bondDist / 2);
        const y1 = p.y - sin * (bondDist / 2);
        const x2 = p.x + cos * (bondDist / 2);
        const y2 = p.y + sin * (bondDist / 2);

        // Bond
        diaCtx.strokeStyle = '#ef4444';
        diaCtx.lineWidth = 4;
        diaCtx.beginPath();
        diaCtx.moveTo(x1, y1);
        diaCtx.lineTo(x2, y2);
        diaCtx.stroke();

        // Atom 1
        diaCtx.fillStyle = '#f87171';
        diaCtx.beginPath();
        diaCtx.arc(x1, y1, r, 0, Math.PI * 2);
        diaCtx.fill();
        diaCtx.strokeStyle = '#fee2e2';
        diaCtx.lineWidth = 1.5;
        diaCtx.stroke();

        // Atom 2
        diaCtx.fillStyle = '#f87171';
        diaCtx.beginPath();
        diaCtx.arc(x2, y2, r, 0, Math.PI * 2);
        diaCtx.fill();
        diaCtx.strokeStyle = '#fee2e2';
        diaCtx.lineWidth = 1.5;
        diaCtx.stroke();
      });

      // --- Draw Monatomic Chamber ---
      nobleCtx.clearRect(0, 0, w, h);
      const sr = 7;

      singles.forEach(s => {
        s.x += s.vx;
        s.y += s.vy;

        if (s.x < sr) { s.x = sr; s.vx *= -1; }
        if (s.x > w - sr) { s.x = w - sr; s.vx *= -1; }
        if (s.y < sr) { s.y = sr; s.vy *= -1; }
        if (s.y > h - sr) { s.y = h - sr; s.vy *= -1; }

        // Glow
        nobleCtx.shadowBlur = 8;
        nobleCtx.shadowColor = currentAtom.color;

        // Atom
        nobleCtx.fillStyle = currentAtom.color;
        nobleCtx.beginPath();
        nobleCtx.arc(s.x, s.y, sr, 0, Math.PI * 2);
        nobleCtx.fill();

        // Highlight
        nobleCtx.shadowBlur = 0;
        nobleCtx.fillStyle = '#ffffff';
        nobleCtx.beginPath();
        nobleCtx.arc(s.x - 2, s.y - 2, 2, 0, Math.PI * 2);
        nobleCtx.fill();
      });

      requestAnimationFrame(updateAndDraw);
    }

    // Handle element pill clicks
    const pills = document.querySelectorAll('.pill');
    pills.forEach(pill => {
      pill.addEventListener('click', () => {
        pills.forEach(p => p.classList.remove('active'));
        pill.classList.add('active');

        currentAtom = {
          sym: pill.dataset.sym,
          name: pill.dataset.name,
          num: pill.dataset.num,
          color: pill.dataset.color
        };

        nobleSub.textContent = `Single Atoms (${currentAtom.sym})`;
        infoBar.innerHTML = `<strong>${currentAtom.name} (${currentAtom.sym})</strong>: Exists as individual unbonded atoms`;
      });
    });

    window.addEventListener('resize', resize);
    resize();
    requestAnimationFrame(updateAndDraw);
  </script>
</body>
</html>

UK-GCSE-SCIENCE-CHEM-AT-02-05

Aligned learning resources

Related diagrams