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Question

Potassium cystallizes in a bcc lattice. Hence, the coordination number of potassium in potassium metal is :

A
0
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B
4
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C
6
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D
8
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Solution

The correct option is B 8
The coordination number is defined as the number of near neighbours to any atom in the arrangement.

Figure below shows a bcc lattice, consider the central atom. We see that it is surrounded by 8 atoms sitting at corners.

File:Physical_Chemistry/Physical_Properties_of_Matter/Solids/Crystal_Lattice/Closest_Pack_Structures/body_centered_cubic_jpeg.jpg

Thus, the coordination number of potassium in potassium metal is 8.

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