Question #4a82b

1 Answer
Dec 11, 2016

Answer:

The reason is their structure on the atomic level.

Explanation:

Graphite is comprised of weakly bonded layers of carbon atoms. This allows it to flake and rub off easily. Diamond, however, has a much more complex and strongly bonded structure, making it one of the hardest materials known to man.
http://www.bbc.co.uk/education/guides/zjgmn39/revision