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Interhalogen Compounds - Structures

What will be ...

Question

What will be the coordination number of cubic close packing (ccp) lattice?

A

12

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B

6

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C

8

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D

4

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Solution

The correct option is A 12
The third layer isn’t aligned with either first or second layer.
Fourth layer, above third layer, repeats first layer's orientation.
Thus, the lattice has ABCABC.. type of packing.

For ccp/fcc structure, the number of nearest neighbors of a particle is 12 as shown.
Such structure is called cubic close packing(ccp) or face-centred cubic (fcc) structure.
$Examples : C a, S r, A g, A u a n d C u$

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Interhalogen Compounds - Structures

Standard XII Chemistry

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