Which metal exhibits more than one oxidation states in their compounds

Which metal exahibits more than one oxidation state:

Which metal represents more than one oxidation state

The exhibition of various oxidation states by an element is also related to the outer orbital electornic configuration of its atom. Atom(s) having which of the following outermost electronic confjigurations will exhibit more than one oxidation state in its compounds

The exhibition of various oxidation states by an element is also related to the outer orbital electornic configuration of its atom. Atom(s) having which of the following outermost electronic confjigurations will exhibit more than one oxidation state in its compounds

Metals exhibit _______ oxidation states in their compounds.

Why alkali metals exhibit +1 oxidation state only in their compounds?