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  4. What is the net charge on ferrous ion?

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Q. What is the net charge on ferrous ion?

AFMCAFMC 2004

Solution:

Iron has atomic number $26$
Electronic configuration
$=1 s^{2} 2 s^{2} 2 p^{6} 3 s^{2} 3 p^{6} 3 d^{6} 4 s^{2}$
$Fe ^{2+}$ (ferrous ion) $1 s^{2} 2 s^{2} 2 p^{6} 3 s^{2} 3 p^{6} 3 d^{6} 4 s^{0}$
$Fe ^{3+}$ (ferric ion) $1 s^{2} 2 s^{2} 2 p^{6} 3 s^{2} 3 p^{6} 3 d^{5} 4 s^{0}$