simple covalent (molecular) compounds

composed of non-metal atoms only; more metallic non-metal written first; prefixes are used in name to indicate number of each atom present -- here are the prefixes for covalent compounds

1

mono

2

di

3

tri

4

tetra

5

penta

6

hexa

7

hepta

8

octa

9

non

10

deca

12

dodeca

P₄S₃

4 P atoms; 3 S atoms

tetraphosphorous trisulfide

N₂O

2 N atoms & 1 O atom

dinitrogen monoxide

BrCl₅

1 Br atom; 5 Cl atoms

bromine pentachloride