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A non-metal X exists in two different fo...

A non-metal X exists in two different forms Y and Z. Y is hardest natural substance, whereas Z is a good conductor of electricity. Identify X, Y and Z.

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A non-metal X is carbon (C ). Carbon exists in two different forms called the allotropes of carbon. These allotropes are diamond graphite. Y is diamond because diamond is the hardest natural substance. Z is graphite which is good conductor of electricity.
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