Question

why diamond is so hard? please answer sincerely or don't answer.​

Answer 1

Answer:

Because of tightly packed molecules. It is the hardest substance ( solid)

Answer 2

The outermost shell of each carbon atom has 4 electrons.

in diamonds, these electrons are shared with four other carbon atoms to form very strong chemical bonds resulting in an extremely rigid tetrahedral crystal.

it is this simple, tightly-bonded arrangement that makes diamond one of the hardest substances on earth

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