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Q.

If a metal has a BCC crystal structure, the coordination number is 81 because :

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a

each atom touches four atoms in the layer above it, four in the layer below it and one in its own layer

b

each atom touches four atoms in the layer above it, four in the layer below it and none in its own layer

c

two atoms touch four atoms in the layer above them, four in the layer below them, and none in their own layer

d

each atom touches eight atoms in the layer above it, eight in the layer below it, and none in their own layer

answer is A.

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Detailed Solution

The coordination number for a metal with a BCC crystal structure is 81 because each atom interacts with four atoms in the layer above it, four atoms in the layer below it, and none in its own layer.

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