Question

Amongst the following ions which one has the highest magnetic moment value? 
(i) \([Cr(H_2O)_6]^{3+}\)
(ii) \([Fe(H_2O)_6]^{2+} \)
(iii)\( [Zn(H_2O)_6]^{2+}\)

Answer 1

(i) No. of unpaired electrons in\( [Cr(H_2O)_6]^{ 3+}\) = 3 
Then, \(μ=\sqrt{n(n+2)}\)
\(=\sqrt{3(3+2)}\)
\(=\sqrt{15}\)
~4BM

(ii) No. of unpaired electrons in\( [Fe(H_2O)_6]^{ 2+} = 4 \)
Then, \(μ=\sqrt{n(n+2)}\)
\(=\sqrt{4(4+2)}\)
\(=\sqrt{24}\)
~5BM

(iii) No. of unpaired electrons in \([Zn(H_2O)_6]^{ 2+} = 0 \)
Hence, \( [Fe(H_2O)_6]^{ 2+} \) has the highest magnetic moment value.