Question

What is the formula for calculating no of lone pairs of any compound?

Answer 1

Get hybrid orbitals first-

1/2[V+M+A-C]

Where,

V-valence electrons of main atom

M-Monovalent atoms(H,F,Cl,Br,I)

A-Anionic charge(if any)

C-cationic charge(if any)

Then finally,

Lone pairs= hybrid orbitals-attached atoms.

Its very simple...