Cobalt typically exhibits valencies of +2 and +3. The most common oxidation state of cobalt in its compounds is +2, as in cobalt(II) oxide (CoO) and cobalt(II) chloride (CoCl₂). The +3 oxidation state is also seen in compounds like cobalt(III) chloride (CoCl₃) and in various coordination complexes.
Valency for cobalt
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