Carbon allotrope: Diamond

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Diamond 

Diamond is one of the  allotropes (different forms of an element in the same physical state) of carbon, its structure is made up purely of carbon atoms bonded by strong covalent bonds. Each carbon atom is covalently bonded to four other carbonatoms in a tetrahedralarrangement with a bond angle of 109.5°. 
              Image result for diamond bond structure


 Diamond has a strong covalent structure, which results in it being a hard substance with a very high melting and boiling point. Diamond is also a poor electrical conductor,as it has no delocalised elcetrons within its structure.

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