The sum of spins of all the electron is the total spins(S) and `(2S+1)` is called spin multiplicity of the electronic configuration. Hund's rule defines the ground state configuration of electrons in degenerate orbitals i.e., orbitals within the same sub-shell which have the same values of n and l, states thta in degenerate orbitals pairing of electrons does not occur unless and until all such orbitals are filled singly with their parallel spin. A spinning electron behaves as though it were a tiny bar magnet with poles lying on the axis of spin. The magnetic moment of any atom, ion or molecule due to spin called spin-only magnetic moment `(m_(s))` is given by the formula.
`mu_(s) = sqrt(n(n+2))B.M`
where `n=` number of unpaired electron(s)
The spin-only magnetic moment of `Cr^(3+)`?

Options

A. `sqrt(3)B.M`
B. `sqrt(8)B.M`
C. `sqrt(15)B.M`
D. Zero

Answer

C

Explanation

`mu_(s) = sqrt(n(n+2))`