CHEM 101: Ion Charge Reference and Polyatomic Ions

Vocabulary practice cards for CHEM 101 ion reference including transition metal cation nomenclature, polyatomic cation formulas, and polyatomic anion formulas organized by charge.

Cation

A positively charged ion formed by metals on the left side of the periodic table.

Anion

A negatively charged ion formed by nonmetals on the right side of the periodic table.

Transition Metal Naming Standard

Charges of d-block transition metals are written in Roman numerals using Stock names (e.g., iron(II) for $Fe^{2+}$).

Ammonium

A polyatomic cation with formula $NH_4^{+}$ and charge $+1$.

Hydronium

A polyatomic cation with formula $H_3O^{+}$ and charge $+1$.

Mercury(I)

A polyatomic cation with formula $Hg_2^{2+}$, having a charge of $+1$ per Hg ($+2$ total charge).

Hydroxide

An anion with formula $OH^{-}$ and charge $-1$.

Cyanide

An anion with formula $CN^{-}$ and charge $-1$.

Acetate

An anion with formula $C_2H_3O_2^{-}$ or $CH_3COO^{-}$ and charge $-1$.

Nitrite

An anion with formula $NO_2^{-}$ and charge $-1$.

Nitrate

An anion with formula $NO_3^{-}$ and charge $-1$.

Permanganate

An anion with formula $MnO_4^{-}$ and charge $-1$.

Hypochlorite

An anion with formula $ClO^{-}$ and charge $-1$.

Chlorite

An anion with formula $ClO_2^{-}$ and charge $-1$.

Chlorate

An anion with formula $ClO_3^{-}$ and charge $-1$.

Perchlorate

An anion with formula $ClO_4^{-}$ and charge $-1$.

Hypobromite

An anion with formula $BrO^{-}$ and charge $-1$.

Bromite

An anion with formula $BrO_2^{-}$ and charge $-1$.

Bromate

An anion with formula $BrO_3^{-}$ and charge $-1$.

Perbromate

An anion with formula $BrO_4^{-}$ and charge $-1$.

Hypoiodite

An anion with formula $IO^{-}$ and charge $-1$.

Iodite

An anion with formula $IO_2^{-}$ and charge $-1$.

Iodate

An anion with formula $IO_3^{-}$ and charge $-1$.

Periodate

An anion with formula $IO_4^{-}$ and charge $-1$.

Hydrogen Carbonate (Bicarbonate)

An anion with formula $HCO_3^{-}$ and charge $-1$.

Hydrogen Sulfate (Bisulfate)

An anion with formula $HSO_4^{-}$ and charge $-1$.

Hydrogen Sulfite (Bisulfite)

An anion with formula $HSO_3^{-}$ and charge $-1$.

Dihydrogen Phosphate

An anion with formula $H_2PO_4^{-}$ and charge $-1$.

Thiocyanate

An anion with formula $SCN^{-}$ and charge $-1$.

Azide

An anion with formula $N_3^{-}$ and charge $-1$.

Peroxide

An anion with formula $O_2^{2-}$ and charge $-2$.

Carbonate

An anion with formula $CO_3^{2-}$ and charge $-2$.

Sulfite

An anion with formula $SO_3^{2-}$ and charge $-2$.

Sulfate

An anion with formula $SO_4^{2-}$ and charge $-2$.

Thiosulfate

An anion with formula $S_2O_3^{2-}$ and charge $-2$.

Chromate

An anion with formula $CrO_4^{2-}$ and charge $-2$.

Dichromate

An anion with formula $Cr_2O_7^{2-}$ and charge $-2$.

Oxalate

An anion with formula $C_2O_4^{2-}$ and charge $-2$.

Hydrogen Phosphate

An anion with formula $HPO_4^{2-}$ and charge $-2$.

Silicate

An anion with formula $SiO_3^{2-}$ and charge $-2$.

Phosphate

An anion with formula $PO_4^{3-}$ and charge $-3$.

Phosphite

An anion with formula $PO_3^{3-}$ and charge $-3$.

Arsenate

An anion with formula $AsO_4^{3-}$ and charge $-3$.