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An Intiative by Sri Chaitanya
a
each atom touches 3 others in same layer, 6 in layer above and 6 in layer below.
b
each atom touches 6 others in same layer, 3 in layer above and 3 in layer below.
c
each atom touches 4 others in same layer, 4 in layer above and 4 in layer below
d
each atom touches 4 others in same layer, 3 in layer above and 3 in layer below.
answer is B, C.
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