1.       DO NOT look at oxidation #’s!!!

2.       For the first part of the formula write the first nonmetal’s symbol and use the prefix to determine its subscript

3.       For the second part, write the second nonmetal’s symbol, again using the prefix to get the subscript

4.       Prefix Meanings:

Mono or none = 1

Di = 2

Tri = 3

Tetra = 4

Penta = 5

Hexa =6

Hepta = 7

Octa = 8

Nona = 9

Deca = 10

5.       Things to look for:

a.        Do not reduce subscripts

b.      DO NOT SWAP AND DROP!!

Dinitrogen hexachloride  N₂Cl₆

Silicon dioxide  SiO₂

Triphosphorus octabromide  P₃Br₈