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Diamond
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Graphite
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i. A diamond is a transparent, usually
colourless, beautiful substance.
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i. Graphite is an opaque, greyish – black substance.
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ii. In a diamond, each carbon atom is linked
to four other adjacent carbon atoms held at the corner of a regular tetrahedron
to form a rigid three – dimensional structure.
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ii. In graphite, each carbon atom is bonded
with three other adjacent carbon atoms to form a hexagonal, planar structure.
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iii. In a diamond, there are no free
electrons.
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iii. In graphite, there are plenty of free
electrons.
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iv. A diamond is a good conductor of heat but
non – conductor of electricity.
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iv. Graphite if a fairly good conductor of
both heat and electricity.
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v. Diamond is the hardest of all substances.
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v. Graphite is soft as its layers slide over
one another due to weak bonds between them.
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