1.

A compound formed by elements \( P \) and \( Q \) crystallises in a cubic lattice where \( P \) atoms are at the corners and \( Q \) atoms are all face centres of the cube. Formula of the compound is

Answer»

As we know,

The contribution of corner atom per unit cell = 1/8. and The contribution of face centres atom per unit cell =1/2

\(\therefore\) Number of P atoms per unit cell = 8 x 1/8

\(\therefore\) Number of Q atoms per unit cell = 6 x 1/2 = 3

Therefore, the formula of compound will be PQ3.



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