A group of
atoms that combine to form a unit with an overall charge. It has its own name
formula and name.
Name
|
Ion Formula
|
Ionic Charge
|
Ammonium
|
NH4
|
1+
|
Nitrate
|
NO3
|
1-
|
Hydroxide
|
OH
|
1-
|
Bicarbonate
|
HCO3
|
1-
|
Chlorate
|
ClO3
|
1-
|
Carbonate
|
CO3
|
2-
|
Sulphate
|
SO4
|
2-
|
Phosphate
|
PO4
|
3-
|
Example: NO3:
the nitrate ion
The nitrate ion is a polyatomic ion with 1 atom of
nitrogen and 3 atoms of oxygen. It has a overall charge of –1.Naming Polyatomic compounds
Writing formulas for polyatomic compounds
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