Question

Diamond is consider as a non metal then why it is hard?

Answer 1

Diamonds are brittle precisely because they are so hard! Hardness is the ability of a material to resist plastic deformation. That is, its ability to resist scratching or denting. ... Atoms in diamond are held together by extremely strong covalent bonds, making them extremely hard.

Answer 2

Because it is Covalent Structure is very hard. So is bond and its cubic structure is very Stable.



Hope it helps you....