Which of the following statements correctly identifies a key property of diamond, an allotrope of carbon, that distinguishes it from graphite?
Diamond is a non-conductor of electricity due to the absence of free electrons.
In diamond, every carbon atom is covalently bonded to four other carbon atoms in a rigid three-dimensional network, so there are no free or delocalised electrons.
Because there are no mobile charge carriers, diamond does not conduct electricity -- unlike graphite, which has delocalised electrons between its layered structure.
Hence, this is the correct answer.
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