Browse Questions

The number of d-electrons retained in $Fe^{2+}$ ion is :

$(a)\;5\qquad(b)\;6\qquad(c)\;3\qquad(d)\;4$

$Fe^{2+}:1s^2,2s^22p^6,3s^33p^63d^6$
Hence (b) is the correct answer.