Name__________________________________________ Date ____________ Period _______
Assigning Oxidation Numbers
Many nonmetals can have more than one oxidation number. These numbers can
sometimes be used in the same manner as ionic charges to determine formulas.
Assign oxidation numbers to each atom in the following compounds or ions:
a. HF
b. CS2
d. CLO2ˉ
c. Na2O2
d. PI3
e. IO3ˉ
The Stock System is actually based on oxidation numbers, and it can be used as an
alternative to the prefix system for naming binary molecular compounds.
PCl3
PCl5
N2O
NO
PbO2
Mo2O3
Prefix System
phosphorus trichloride
phosphorus pentachloride
dinitrogen monoxide
nitrogen monoxide
lead dioxide
dimolybdenum trioxide
Stock System
phosphorus(III) chloride
phosphorus (IV) chloride
nitrogen(I) oxide
nitrogen(II) oxide
lead (IV) oxide
molybdenum(III) oxide
Name each of the following binary molecular compounds according to the Stock System:
a. CI4
b. SO3
c. As2S3
d. NCl3
e. CS2
f. KF
g. PBr3