CBSE Class 11-science Answered
Correct Option: 2
No. of atoms contributed by the corner atoms to an unit cell is 1/8×8 =1
No. of atoms contributed by the face centred atoms to the unit cell is 1/2 × 6 = 3
And Atoms inside the structure =4
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
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