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An element belonging to group 14 of the ...

An element belonging to group 14 of the periodic table has two common allotrpoes A and B. A is very hard and a non conductor of electricity while B is soft to touch and good conductor of electricity . Identify the element . Name each of these allotropes.

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The element is carbon and the two allotropes are diamond and graphite. Diamond has three-dimensional rigid structure and does not have any free electrons. Hence, it is hard and bad conductor of electricity. Graphite forms hexagonal sheet-like structure and one valency (one electron) with carbon is free. Hence, graphite is soft and a good conductor of electricity.
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