Variable valency Chemistry, knowledgeuniverseonline.com

Chapter : 3. Atoms & Molecules

Variable valency

Variable valency
There are certain elements that exhibit more than one valencies in their ions (or compounds).
Ex. Iron can exist as Fe²⁺ or Fe³⁺ in its compounds. In such cases the name of the ion with lower valency ends with a suffix ‘ous’ while that with higher valency ends with a suffix ‘ic’.
Some basic ions exhibiting variable valency

Name of Ions	Formula
Cuprous	Cu⁺/
Cupric	Cu²⁺
Mercurous	Hg₂²⁺
Mercuric	Hg²⁺
Ferrous	Fe²⁺
Ferric	Fe³⁺
Plumbous	Pb²⁺
plumbic	Pb⁴⁺
Stannous	Sn²⁺
Stannic	Sn⁴⁺
Aurous	Au⁺
Auric	Au³⁺

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Chemistry

Chapter : 3. Atoms & Molecules

Variable valency

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