1. Chemical Nomenclature
Covalent Compounds

2. Molecular Compounds Covalent bonds occur between two nonmetals.
Compounds made up of only nonmetals are called molecular compounds

3. Molecular Compounds
The same elements can often bond in several ways with each other:
For example, Carbon and Oxygen can combine as CO, a poisonous gas, and CO2, the gas you exhale when breathing.
So, molecular compound names must specify how many of each atom participate in the compound.

4. Molecular compounds Prefix Number of Atoms Mono- 1 Hexa- 6 Di- 2
Hepta- 7
Tri- 3
Octa- 8
Tetra- 4
Nona- 9
Penta- 5
Deca- 10

5. Molecular Compounds Keys to remember:
The mono- prefix is only applied to the second element.
The more electronegative element is listed second.
All compounds end in -ide

7. Dinitrogen Tetrahydride Dihydrogen monosulfide Nitrogen monoxide
Practice
Write the names for the following compounds:
N2H4
H2S NO
CBr4
Dinitrogen Tetrahydride
Dihydrogen monosulfide
Nitrogen monoxide
Carbon tetrabromide

8. Disulfur decafluoride Diphosphorus trichloride SiF2 NF3 S2F10 P2Cl3
Practice
Write the formulas for the following compounds:
Silicon difluoride
Nitrogen trifuoride
Disulfur decafluoride
Diphosphorus trichloride
SiF2
NF3
S2F10
P2Cl3