An ion `(Mn^(a+))` has the magnetic moment equal to `4.9` B.M` What is the value of (a) :

Answer

3

Explanation

`:.` Magnetic moment ` sqrt(n( n + 2)) = 4.9`
` :. n =4` (where (n) no. ofunpared elctron 0
thus `Mn^(a+) ` ion has hour unpaired electron .
` ._(25) Mn^(3+) : 1s^2, 2^2 2p^6 . 3s^ 3p^2 3p^6 3d4`
` :. A=3` .