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Classification of solids and crystal lattices
NEET level
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Difficulty 1 of 3
ss002
The coordination number of an atom in a cubic close packed (ccp) structure is
A
6
B
8
C
4
D
12
Answer: D
In ccp each sphere touches 6 in its own layer, 3 in the layer above and 3 in the layer below, giving
6
+
3
+
3
=
12
.
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