Formula of a compound formed by A²+ and B- is
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A atoms are at the corners of the cube. There are 8 corners and each contributes one eight to the unit cell. Total number of A atoms =8×
8
1
=1.
B atoms are at the face centres of the cube. There are 6 face centres and each contributes one half to the unit cell. Total number of B atoms =6×
2
1
=3.
The formula of the compound is AB
3
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