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  </url>

  <!-- Period 5 -->
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    <loc>https://modern-periodic-table.com/rubidium-properties</loc>
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  <!-- Period 6 -->
  <url>
    <loc>https://modern-periodic-table.com/cesium-properties</loc>
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  <url>
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  <url>
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  <url>
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  <url>
    <loc>https://modern-periodic-table.com/europium-properties</loc>
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  <url>
    <loc>https://modern-periodic-table.com/gadolinium-properties</loc>
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    <loc>https://modern-periodic-table.com/terbium-properties</loc>
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  <!-- Period 7 -->
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