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  4. The number of unpaired electrons in ferrous ion(Z = 26) is

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Q. The number of unpaired electrons in ferrous ion(Z = 26) is

MP PMTMP PMT 1995The d-and f-Block Elements

Solution:

Fe(Z = 26) : $1s^2\, 2s^2\, 2p^6 \,3s^2\, 3p^6 \,4s^2 \,3d^2$
$Fe^{2+}$ (ferrous ion) : $1s^2\, 2s^2\, 2p^6\, 3s^2 \,3p^6\, 3d^6$
Number of unpaired electrons = 4.