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<h1>Carbon, C</h1>

<h2>Most common allotropes</h2>
<ul>
<li>Diamond (cubic carbon)</li>
<li>Graphite</li>
<li>Amorphous carbon</li>
<li>Graphene</li>
</ul>

<h2>External links</h2>
<ul>
<li><a href="https://en.wikipedia.org/wiki/Carbon">Carbon - Wikipedia</a></li>
<li><a href="https://en.wikipedia.org/wiki/Diamond">Diamond - Wikipedia</a></li>
<l