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  4. The number of unpaired electrons in ferrous ion is:

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Q. The number of unpaired electrons in ferrous ion is:

JIPMERJIPMER 2001The d-and f-Block Elements

Solution:

$ {}_{26}Fe=1{{s}^{2}},2{{s}^{2}}2{{p}^{6}},3{{s}^{2}}3{{p}^{6}}3{{d}^{6}},4{{s}^{2}} $ $ F{{e}^{2+}}=[Ar]\,3{{d}^{6}} $ $ $ Hence, unpaired electrons in $ F{{e}^{2+}} $ (ferrous ion) = 4