Explain the difference in properties of diamond and graphite on the basis of their structures.

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$Diamond$$Graphite$
It has a three-dimensional crystalline lattice.It has a two-dimensional layered structure.
Each carbon atom is $sp^3$ hybridized and bonded to four other carbon atoms in a tetrahedral arrangement.Each carbon atom is $sp^2$ hybridized and bonded to three other carbon atoms in a planar hexagonal arrangement.
The $C-C$ bond length is $154 \ pm$.The $C-C$ bond length within the layers is $141.5 \ pm$.
It acts as an electrical insulator because all valence electrons are involved in strong covalent bonds.It is a good conductor of electricity due to the presence of free electrons in the delocalized $\pi$-system.
It has a rigid,hard covalent network structure.It is soft and slippery because the layers are held together by weak van der Waals forces.
Used as an abrasive for sharpening hard tools.Used as a dry lubricant in machines operating at high temperatures.

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