The sping only maagentic mome ( in Bohr magneton , `M_C)` of ` Hi^(2+)` in aqueouse solution would be :

Options

A. ` 2. 84`
B. `4 . 90`
C. `0`
D. `1.73`

Answer

A

Explanation

`Ni^(2+) : 1s^2 , 2s^2 2p^t6 , 3s^2 3p^6 3d^8`
(with two unpairel dlectrons )
The manganetic moment
` = sqrt ( n (n + 2)) = sqrt ( 2(2+2)) = sqrt 8= 2.83 BM`.