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Its first four ionisation energies, 1086.5, 2352.6, 4620..7 k J/mol, are much higher than those of the heavier group 14 elements.

The electronegativity of carbon is 2.5, significantly higher than the heavier group 14 elements (1.8–1.9), but close to most of the nearby nonmetals as well as some of the second- and third-row transition metals.

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The three relatively well-known allotropes of carbon are amorphous carbon, graphite, and diamond.This gives graphite its softness and its cleaving properties (the sheets slip easily past one another).Because of the delocalization of one of the outer electrons of each atom to form a π-cloud, graphite conducts electricity, but only in the plane of each covalently bonded sheet.This results in a lower bulk electrical conductivity for carbon than for most metals.The delocalization also accounts for the energetic stability of graphite over diamond at room temperature.

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