Naming molecular compounds

Molecular compounds occur between non-metal and from a covalent bond.

In molecular compounds a prefix is used to indicate the number of each atom present.

**If there is only one of the first element, we omit the prefix but if there is only one of the second element we add the prefix**

Prefix	Number of atoms
Mono	1
Di	2
Tri	3
Tetra	4
Penta	5
Hexa	6
Hepta	7
Octo	8
Nona	9
Deca	10

Examples:

CO – Carbon Monoxide

CS₂ – Carbon disulphide

P₂ S₅ – Diphosphorous pentasulfide