Ionic Compounds (Ion Charges)

How monoatomic ions form

Metals lose electrons and nonmetals gain electrons to achieve the same number of electrons as the nearest noble gas

Charge of main group metal cations

Equal to the group number

Charge of main group nonmetal anions

Equal to the group number minus 8

Lithium ion

Li⁺

Beryllium ion

Be²⁺

Sodium ion

Na⁺

Magnesium ion

Mg²⁺

Potassium ion

K⁺

Calcium ion

Ca²⁺

Rubidium ion

Rb⁺

Strontium ion

Sr²⁺

Cesium ion

Cs⁺

Barium ion

Ba²⁺

Fluoride ion

F⁻

Chloride ion

Cl⁻

Bromide ion

Br⁻

Iodide ion

I⁻

Oxide ion

O²⁻

Sulfide ion

S²⁻

Nitride ion

N³⁻

Phosphide ion

P³⁻

Aluminum ion

Al³⁺

Zinc ion

Zn²⁺

Silver ion

Ag⁺

Cadmium ion

Cd²⁺

Copper(I) ion

Cu⁺

Copper(II) ion

Cu²⁺

Iron(II) ion

Fe²⁺

Iron(III) ion

Fe³⁺

Cobalt(II) ion

Co²⁺

Nickel(II) ion

Ni²⁺

Chromium(III) ion

Cr³⁺

Chromium(VI) ion

Cr⁶⁺

Manganese(II) ion

Mn²⁺

Platinum(II) ion

Pt²⁺

Gold(I) ion

Au⁺

Gold(III) ion

Au³⁺

Mercury(I) ion

Hg₂²⁺

Mercury(II) ion

Hg²⁺