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A solid with cubic crystal is made of tw...

A solid with cubic crystal is made of two elements P and Q. Atoms of Q are at the corners of the cube and P at the body-centre. The formula of the compound will be:

A

`PQ_4`

B

`PQ`

C

`PQ_2`

D

`PQ_3`

Text Solution

Verified by Experts

The correct Answer is:
B
As atoms of Q are present at the 8 centres of the cube, therefore, number of atoms of Q in the unit cell = 18 x 8 = 1 The atom P is at the body centre. Therefore, number of atoms - 1 Ratio of atoms P:Q=1:1. Hence, the formula of the compound is PQ.
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