Calculate the spin only magentic moment of `M^(2+)` ion `(Z=27)`.

Explanation

In a medium (like Water) `d^3` is more stable as compared to `d^5`.
`M(Z=27)implies3d^74s^2,M^(2+)implies3d^74s^0`
Thus it has 3 unpaired electrons and hence.
`mu=sqrt(3(3+2))=sqrt(15)BM=3.87BM`.