Transcribed Image Text: Polyatomic lons
The sum of the oxidation numbers of Polyatomic ions is not equal to zero.
Some polyatomic ions, their formulas, names, as well as the oxidation numbers of
their central atoms are given below. Show how you will solve for the oxidation
2.
number of the ions following the example given. Remember that oxygen is -2 except
in peroxides where it is -1.
Polyatomic lon
Formula
Oxidation
Oxidation Number
Number of
of Polyatomic lon
Central Atom
30 + 10
Example: carbonate
CO3
C+4
(-2×3) + (1x+4)=-2
1. Sulfate
SO4
S+6
2. Phosphate
PO4
P+5
3. Permanganate
Mn04
Mn*7
4. Chromate
Cr207
Cr*6
5. Tetraborate
B407
B+3
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