martes, 30 de octubre de 2012

Polyatomic ions


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