Transition elements

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Question

Considering $H_{2} O$ as a weak field ligand, the number of unpaired electrons in $[Mn {{(H_{2} O)}_{6}]}^{2 +}$ is

Moderate

Solution

$Mn 3 d^{5} 4 s^{2}$
${Mn}^{2 +} 3 d^{5}$ (i.e.) 5 unpaired electrons because $H_{2} O$ is week field ligand and does not force to pairing.

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