chem memory

Arsenic

As -3

Phosphorus

P -3

Nitrogen

N -3

Oxygen

O -2

Sulfur

S -2

Selenium

Se -2

Tellurium

Te -2

Fluorine

F -1

Chlorine

Cl -1

Bromine

Br -1

Iodine

I -1

Astatine

At -1

Radium

Ra +2

Barium

Ba +2

Strontium

Sr +2

Calcium

Ca +2

Magnesium

Mg +2

Beryllium

Be +2

Francium

Fr +1

Cesium

Cs +1

Rubidium

Rb +1

Potassium

K +1

Sodium

Na +1

Lithium

Li +1

Hydrogen

H +1

Silver

Ag +1

Aluminum

Al + 3

Gallium

Ga +3

Zinc

Zn +2

Cadmium

Cd +2

NH₄¹⁺

Ammonium

C₂H₃O₂^1- or CH₃COO^1-

Acetate

CO₃^2- 

Carbonate

HCO₃^1-

Hydrogen Carbonate or Bicarbonate 

ClO^1-

Hypochlorite

ClO₂^1-

Chlorite

ClO₃^1-

Chlorate

ClO₄^1-

Perchlorate

CrO₄^2-

Chromate

Cr₂O₇^2-

Dichromate

CN^1-

Cyanide

OCN^1-

Cyanate

SCN^1-

Thiocyanate

OH^1-

Hydroxide

NO₂^1-

Nitrite

NO₃^1-

Nitrate

MnO₄^1-

Permanganate

PO₄^3-

Phosphate

HPO₄^2-

Hydrogen Phosphate

H₂PO₄^1-

Dihydrogen Phosphate

SO₃^2-

Sulfite

SO₄^2-

Sulfate

HSO₄^1-

Hydrogen Sulfate or Bisulfate

S₂O₃^2-

Thiosulfate

AsO₃^3-

Arsenite

AsO₄^3-

Arsenate

C₂O₄^2-

Oxalate

O₂^2-

Peroxide