Question

what is the number of carbon atoms per unit cell of diamond unit cell..

Answer 1

So total number of atoms present in a diamond cubic unit cell is 1 + 3 + 4 = 8.
Since each carbon atom is surrounded by four more carbon atoms, the co-ordination number is 4.

Answer 2

so,total number of atoms present in a diamond cubic unit cell is 1+3+4 is 8 since,each carbon atom surrounded by 4 more carbon atom