Question

Sort the following according to the decreasing order of magnetic moments.

• A. $Ni(CO{)}_4$
• B. ${\left[\mathrm{Ni}\right(N{H}_3{)}_6]}^{2+}$
• C. ${\left[\mathrm{Mn}\right(\mathrm{CN}{)}_6]}^{4-}$
• D. ${\left[\mathrm{Mn}\right(\mathrm{Cl}{)}_4]}^{-2}$

Answer 1

$Ni(CO{)}_4$ has no unpaired electrons, hence magnetic moment is null.
$\left[Mn\right(CN{)}_6{]}^{4-}$ has 1 unpaired electron, hence the magnetic moment is 1.73 BM.
$\left[Ni\right(N{H}_3{)}_6{]}^{2+}$ has 2 unpaired electrons, hence the magnetic moment is 2.82 BM.
$\left[Mn\right(Cl{)}_4{]}^{2-}$ has 5 unpaired electrons, hence the magnetic moment is 5.93 BM.