1. Binary Covalent Nomenclature

2. Use Greek Prefixes 1 = mono- 2 = di- 3 = tri- 4 = tetra- 5 = penta-
6 = hexa-
7 = hepta-
8 = octa-
9 = nona-
10 = deca-

3. The Rules
Tell how many atoms of the first element there are with a Greek prefix (if there is only one then omit the mono)
Name the first element
Tell how many atoms of the second element there are with a Greek prefix (do not omit the mono)
Name the second element, but change the end of the name to -ide

4. A Few Special Exceptions
H2O
Should be dihydrogen monoxide but is called water instead
NH3
Should be nitrogen trihydride but is called ammonia instead
CH4
Should be carbon tetrahydride but is called methane instead
HCl
Should be hydrogen monochloride but is called hydrogen chloride instead.

5. Practice N2O4 Dinitrogen tetraoxide (tetroxide) PCl3
Phosphorus trichloride
SO2
Sulfur dioxide

6. Practice CO
Carbon monoxide
P4O10
Tetraphosphorus decoxide
NH3
Ammonia

7. Practice NH4Cl Ammonium chloride ClO2 Chlorine dioxide FeO
Iron(II) oxide

8. Practice
BaNa2S
Bananas
HIOAg
Lone Ranger Acid