First slide

Transition elements

Question

Out of the following, how many of them have magnetic moment value $2 \sqrt{12}$ BM.
${Mn}^{2 +}, {Mn}^{+}, {Re}^{2 +}, {Re}^{+}, {Tc}^{+}, Cr, W$

Moderate

Solution

$\begin{array}{l} {Mn}^{+}, {Re}^{+}, {Tc}^{+} and Cr have \\ μ = \sqrt{48} BM = 2 \sqrt{12} BM \\ = \sqrt{n (n + 2)} \Rightarrow n = 6 unpaired e^{-} s \end{array}$

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