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Chemistry Question on d block elements

An element is in M3+{{M}^{3+}} form. Its electronic configuration is [Ar] 4s1[Ar]\,4{{s}^{1}} . What is the atomic number of element?

A

21

B

19

C

24

D

22

Answer

22

Explanation

Solution

When element is in M3+{{M}^{3+}} form, its electronic configuration is [Ar] 4s1,[Ar]\,4{{s}^{1}}, hence, electronic configuration of M will be [Ar] 4s23d2.[Ar]\,4{{s}^{2}}3{{d}^{2}}. Hence, atomic number of element (M) = 18 + 4 = 22.