# element occurs in different forms called their allotropic forms

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[00:00:00]Carbon has several allotropes. Diamond is the hardest natural sub substance.

[00:00:05]Graphite is soft and used in pencils.

[00:00:07]Carbon nanot tubes have special electrical properties.

[00:00:10]>> Graphite consists of layered carbon atoms held by weak Vanderwal's forces.

[00:00:14]Diamond's 3D network of strong covealent bonds creates a rigid hard structure.

[00:00:18]Graphine is a flexible