polyatomic

• NH4

+ Ammonium MnO4 Permanganate

• OH- Hydroxide CrO4

2- Chromate

• NO2

- Nitrite Cr2O7

2- Dichromate

• NO3

- Nitrate

• BrO3

- Bromate

• ClO- Hypochlorite

• ClO2

- Chlorite• ClO3

- Chlorate

• ClO4

- Perchlorate

• CH3COO- Acetate

• CO3

2- Carbonate

• SO3

2- Sulfite

• SO4

2- Sulfate

• PO4

3- Phosphate