Table 2.4: Common Type II Cations

Ion Systematic Name

Fe³⁺ Iron(III)

Fe²⁺ Iron(II)

Cu²⁺ Copper(II)

Cu⁺ Copper(I)

Co³⁺ Cobalt(III)

Co²⁺ Cobalt(II)

Sn⁴⁺ Tin(IV)

Sn²⁺ Tin(II)

Pb⁴⁺ Lead(IV)

Pb²⁺ Lead(II)

Hg²⁺ Mercury(II)

Hg₂²⁺ * Mercury(I)

Ag⁺ Silver †

Zn²⁺ Zinc †

Cd²⁺ Cadmium †

* Note that mercury(I) ions always occur
bound together to form Hg₂²⁺ ions.
† Although these are transition metals,
they form only one type of ion, and a
Roman numeral is not used.

Ion	Systematic Name
Fe³⁺	Iron(III)
Fe²⁺	Iron(II)
Cu²⁺	Copper(II)
Cu⁺	Copper(I)
Co³⁺	Cobalt(III)
Co²⁺	Cobalt(II)
Sn⁴⁺	Tin(IV)
Sn²⁺	Tin(II)
Pb⁴⁺	Lead(IV)
Pb²⁺	Lead(II)
Hg²⁺	Mercury(II)
Hg₂²⁺ *	Mercury(I)
Ag⁺	Silver †
Zn²⁺	Zinc †
Cd²⁺	Cadmium †
* Note that mercury(I) ions always occur bound together to form Hg₂²⁺ ions. † Although these are transition metals, they form only one type of ion, and a Roman numeral is not used.