Transition elements show magnetic moment due to spin and orbital motion of electrons. Which of the following metallic ions have almost same spin only magnetic moment?

Options

A. `Co^(2+)`
B. `Cr^(2+)`
C. `Mn^(2+)`
D. `Cr^(3+)`

Answer

a,d

Explanation

`Co^(2+) = 3d^(7) , Cr^(2+), Cr^(3+)= 3d^(3) , Mn^(2+)= 3d^(5)`.Thus, `Co^(2+)` and `Cr^(3+)` have the same number of unpaired electrons viz. 3