Spam this practice about 3-4 times to not have to worry about remembering polyatomic ions and what some compounds are called.
NH₄⁺
Ammonium
NH₃
Ammonia
H₃O⁺
Hydronium (Heavy Water)
Cl⁻
Chloride
O²⁻
Oxide
N³⁻
Nitride
F⁻
Fluoride
P³⁻
Phosphide
Se²⁻
Selenide
Te²⁻
Telluride
I⁻
Iodide
Al³⁺
Aluminum ion
Zn²⁺
Zinc ion
Ag⁺
Silver ion
OH⁻
Hydroxide
CN⁻
Cyanide
C₂H₃O₂⁻
Acetate
CO₃²⁻
Carbonate
HCO₃⁻
Bicarbonate (Hydrogen Carbonate)
ClO₄⁻
Perchlorate
ClO₃⁻
Chlorate
ClO₂⁻
Chlorite
ClO⁻
Hypochlorite
MnO₄⁻
Permanganate
PO₄³⁻
Phosphate
PO₃³⁻
Phosphite
SO₄²⁻
Sulfate
SO₃²⁻
Sulfite
NO₃⁻
Nitrate
NO₂⁻
Nitrite
BrO₄⁻
Perbromate
BrO₃⁻
Bromate
BrO₂⁻
Bromite
BrO⁻
Hypobromite
IO₄⁻
Periodate
IO₃⁻
Iodate
IO₂⁻
Iodite
IO⁻
Hypoiodite
HSO₄⁻
Bisulfate (Hydrogen Sulfate)
HSO₃⁻
Bisulfite (Hydrogen Sulfite)
HPO₄²⁻
Hydrogen Phosphate
H₂PO₄⁻
Dihydrogen Phosphate
CrO₄²⁻
Chromate
Cr₂O₇²⁻
Dichromate
S₂O₃²⁻
Thiosulfate
HCN
Hydrocyanic Acid
H₂S
Hydrosulfuric acid
H₂SO₄
Sulfuric Acid
H₂SO₃
Sulfurous Acid
HBr
Hydrobromic Acid
HNO₂
Nitrous Acid
HNO₃
Nitric Acid
H₃PO₄
Phosphoric Acid
HClO₄
Perchloric Acid
HClO₃
Chloric Acid
HClO₂
Chlorous Acid
HClO
Hypochlorous Acid
HCl
Hydrochloric Acid
CH₃COOH
Acetic acid
Hg²⁺
Mercury (II)
Hg₂²⁺
Mercury (I)