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Which of the following has maximum number of unpaired electrons?

$(1) Mg^{3+} \quad (2) Ti^{3+} \quad (3) V^{3+} \quad (4) Fe^{2+}$
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Answer: $Fe^{2+}$
Electron configuration of $Fe^{2+}$ is $[Ar]3d^6$. Therefore it has four unpaired electrons.
answered Aug 4, 2014 by balaji.thirumalai

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