Question

A cubic solid is made of two elements P and Q. Atoms of Q are at the corners of the cube and P at the body-centre. What is the formula of the compound? What are the coordination numbers of P and Q?

Answer 1

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A cubic solid is made of two elements P and Q. Atoms of Q are at the corners of the cube and P at the body-centre. What is the formula of the compound? What are the coordination numbers of P and Q?

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Atoms of Q are the corners of the cube and P at the body- centre

Therefore, Number of atoms of Q in one unit cell =8×⅛=1

Number of atoms of P in one unit cell =1

Therefore, Ratio of P and Q atoms = P:Q = 1:1

Therefore, formula of the given compound = PQ

Since it is bcc

Therefore, coordinate number of P and Q = 8

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