Question

A transition metal X has a configuration [Ar] $3d^4$ in its +3 oxidation state. The atomic number of the metal is:

• A. $26$
• B. $22$
• C. $19$
• D. $25$

Answer 1

The correct option is D $25$

The configuration in +3 oxidation state is $\left[Ar\right]3d^4$.

Therefore, in ground state, configuration is $\left[Ar\right]4s^{2}3d^5$.

Therefore, element is manganese with atomic number $=25$.