Question

A first row transition metal in its +2 oxidation state has a spin-only magnetic moment value of 3.86 BM. The atomic number of the metal is 

(1) 25 

(2) 26 

(3) 22 

(4) 23

Answer 1

Correct option is (4) 23

\({ }_{22} \mathrm{Ti}^{+2} \Rightarrow[\mathrm{Ar}] 3 \mathrm{~d}^2\)

\( { }_{23} \mathrm{~V}^{+2} \Rightarrow[\mathrm{Ar}] 3 \mathrm{~d}^3\)

\({ }_{25} \mathrm{Mn}^{+2} \Rightarrow[\mathrm{Ar}] 3 \mathrm{~d}^5\)

\({ }_{26} \mathrm{Fe}^{+2} \Rightarrow[\mathrm{Ar}] 3 \mathrm{~d}^6\)