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Question

Chemistry Question on d -and f -Block Elements

Which of the following exhibits only + 3 oxidation state ?

A

Th

B

Ac

C

Pa

D

U

Answer

Ac

Explanation

Solution

Actinium:- Atomic No = 89 Configuration = [Rn]6d17s2 {[Rn] 6d^17s^2} stable oxidation state ⇒\Rightarrow +3 Th = +3, +4 Pa = +3, +4, +5 U = +3, +4, +5, +6