Question

Barium titanate has the pervoskite structure, i.e. a cubinc lattice with `Ba^(2+)` ions at the corners of the unit cell, oxide ions at the face centres and titanium ions at the body centred. The molecular formula of barium titante is
A. `BaTiO_(3)`
B. `BaTiO_(4)`
C. `BaTiO_(2)`
D. `BaTiO`

Answer 1

(a) Number of `Ba^(2+)` ions at the corner of unit cell
`=8xx(1)/(8)=1`
Number of `O^(2-)` ions at the face centres=`=6xx(1)/(2)=3`
Number of `Ti^(4+)` ions at the body centre=1
Molecular formula of barium titanate =`BaTiO_(3)`