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

The given ions are : `Co^(2+)(3d^(7)), Cr^(2+)(3d^(4)), Mn^(2+)(3d^(5)), Cr^(3+)(3d^(3))`, out of these `Co^(2+)` and `Cr^(3+)` have same number (i.e., 3) of unpaired electrons and hence, same spin only meagnetic moment.