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Define 'Allotrope'.
Different structural forms of the same element in the same physical state.
Why does diamond not conduct electricity?
It has no delocalized electrons or ions; all electrons are tied up in strong covalent bonds.
Why is graphite soft/slippery?
The layers are held by weak forces, allowing them to slide over each other.
How many bonds does each carbon atom form in diamond vs. graphite?
Diamond = 4 bonds; Graphite = 3 bonds.
What is graphene?
A single, isolated layer of graphite.
Why does graphite conduct electricity?
Each carbon atom has one delocalized electron that is free to move around and carry a charge.