1.

In a face centred cubic lattice, atom A occupies the corner positions and atom B occupies the face centre positions. If one atom of B is missing from one of the face centred points, the formula of the compound is :

Answer»

`A_(2) B_(3)`
`A_(2) B_(5)`
`A_(2)B`
`AB_(2)`

Solution :No. of .A. atoms at corners `= 8 xx ( 1)/( 8 ) =1 `
No. of .B. atoms at FACE CENTRES `= 5 xx ( 1)/( 2) = ( 5)/( 2)`
Formula `=A_(1) B_(5//2) ` or `A_(2) B_(5)`


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