Question

Why a silicon analogue of graphite does not exist?

Answer 1

Catenation is what it lacks! Carbon has the rare and special property of catenation that allows it to form graphite and diamond and all the complex organic compound. Even after being in the same group silicon doesn't have this because silicon’s bonds with itself are not very strong due to large orbital’s overlap and it's size is a lot bigger than carbon.

Answer 2

Graphite is a macro molecule which is made up of hexagonalcarbon rings. ... A C-C bond isvery strong, providing high stability to the molecule. however a Si-Si bonds is not so strong. This is why silicon cannot form macro molecules with itself likecarbon.

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