If three elements A, B and C crystallize in a cubic solid lattic with A atom at the corner, B atoms at cube centre and C atoms at edges then what would be the formula of the solid?
Atom A is shared by 8 corners 1
atoms of C is shared by 4 unit cells
Atom B is present at centre of the unit cell
Hence, effective number of atoms of A per unit cell = 8× 1/8 = 1
Effective number of atoms of C per unit cell = 12/4 = 3
Effective number of atoms of B per unit cell = 1 Hence, the formula of the compound is ABC3