In a solid 'AB'havingNaCl structure , 'A' atoms occupy the corners of the cubic unit cell. If all the face-centred atoms along one of the axes are removed, then the resultant stoichiometry of the solid is

In a solid 'AB'havingNaCl structure , 'A' atoms occupy the corners of

1.	In a solid 'AB'havingNaCl structure , 'A' atoms occupy the corners of the cubic unit cell. If all the face-centred atoms along one of the axes are removed, then the resultant stoichiometry of the solid is
Answer» `AB_(2)` `A_(2)B` `A_(4)B_(3)` `A_(3)B_(4)` Solution :There were 6 A atoms on the face-centres. Removing face-centred atoms along one of the axes MEANS removal of 2 A atoms . Now, no , of atoms per unit cell `= 8 xx 1/8 + 4 xx 1/2 = 3 ` No. of B atoms per unit cell ` 12 xx 1/4+ 1 = 4` HENCE, the resultant stoichimetry is ` A_(3)B_(4)`