Calculate the magnetic moment of a divalent ion in aqueous solution if its atomic number is 25.

Options

A. `3.0` BM
B. `4.9` BM
C. `5.9` BM
D. `6.9` BM

Answer

C

Explanation

`M(Z = 25) : 1s^(2) 2s^(2) 2p^(6) 3s^(2) 3p^(6) 4s^(2) 3d^(5)`
`M^(2+) : 1s^(2) 2s^(2) 2p^(6) 3s^(2) 3p^(6) 3d^(5)`
No. of unpaired electron =5
Magnetic moment `= sqrt(n(n+2)) = sqrt(5(5+2))`
`= sqrt(35) =5.9 BM`