Question

Atomicity of aluminium phophate
With answer

Answer 1

Total number of atoms in a molecule is atomicity.

Hence Ammonium Phosphate : (NH4)3PO4

(1 + 4)*3 + 1 + 4 = 20

please choose as brain list.

Answer 2

in general atomoicity is defined only for homonuclear molecules e.g. For S8 the atomicity is 8. But in case atomicity is asked for a heteronuclear molecule then atomic simply means the total number of atoms present in the given molecule e.g the atomicity of ammonium phosphate (NH4)3PO4 is 3(1+4)+ 1 + 4 = 20.

Though conceptually atomicity must be calculated for homonuclear molecules only.