Question

Name a transition element which has no variable oxidation state?

Answer 1

I can't think of one offhand mate....

Explanation:

The transition elements, generally have several oxidation states available. For the first transition series, `M(+II)` and `M(+III)` salts are widespread....

The f-block elements, and Group 3 of the transition series, are GENERALLY `M(+III)`, however, even here, `M(0)`, `M(+I)`, and `M(+II)` salts and complexes are accessible, even if special means have to be employed to synthesize and isolate them...

Answer 2

Probably no element except the lighter noble gases is limited to one oxidation state at all times, but scandium and yttrium, both transition metals, come close.

Explanation:

Nearly all elements, even alkali and alkaline earth metals, can show "unusual oxidation states under the right conditions. But scandium and yttrium are in the +3 oxidation state under almost all commonly encountered conditions.