Nomenclature of Molecular compounds
Name the least electronegative nonmetal first using the prefix
denoting how many are in the formula then prefix + root of the most
electronegative nonmetal + ide ending:
Iodine pentafluoride
SO3 Sulfur trioxide
IF5
CO Carbon monoxide
N2Br4
Dinitrogen tetrabromide
Notice that the formula is written as least electronegative to most electronegative.
Notice that the number of elements in the compound is mentioned in the name.
Notice that the first nonmetal does not use a prefix if there is only one.
Prefixes:
1 – mono
2 – di
3 – tri
4 – tetra
5 – penta
6 – hexa
7 - hepta
8 – octa
9 - nona
10 - deca
There are also molecular
compounds that only use their
common name. For example:
H2O is water
NH3 is ammonia
H2O2 is hydrogen peroxide
PRACTICE PROBLEMS #9c
1. AsCl3
Arsenic trichloride
3. XeF4
Xenon tetrafluoride
5. P2S3
Diphosphorus trisulfide
7. SF6
9.
Sulfur hexafluoride
Phosphine, this is
PH3 another exception.
11. P4O10
Tetraphosphorus
decaoxide
2. SeO
4.
Selenium
monoxide
Diboron
B2O3 trioxide
6. SiO2
Silicon
dioxide
8. NI3
Nitrogen
triiodide
10.
Carbon
CBr4tetrabromide
12.
Oxygen
OF2 difluoride
GROUP STUDY PROBLEMS #9c
1. SeCl2
2. NO
3. CF4
4. N2O4
5. NH3
6. SiO4
7. ClF
8. CO2
9. Phosphorus triiodide
10. Sulfur dioxide
11. Dinitrogen tetrachloride
12. Hydrogen peroxide
13. Arsenic monophosphide 14. Diboron trioxide