Question

What do diamonds, the ‘lead’ in pencils and coal have in common?

Answer 1

Coal is made up of Carbon, Hydrogen, Sulfur, Oxygen, Nitrogen. Diamond,coal, and pencil lead have a lot of things in common. ... So, that is what you can do with coal. Diamond and Graphite are different and very much the same, both are made of pure carbon, but, one is soft and the other is hard.

Answer 2

HEYA! !

HERE'S YOUR ANSWER
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Diamonds, Graphite (lead) and Coal.

These 3 substances are made up of a common compound, i.e, Carbon.

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Diamond has a linked Carbon structure and that is why it is hard.

Graphite has a layered structure and that is why it is soft.

Coal is a complex compound of Carbon.

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So, the common thing is _all are made up of Carbon links_.
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