Question

A d-block element iron $\left(Fe\right)$ forms two types of compounds, $FeS{O}_4$ and $F{e}_2(S{O}_4{)}_3$.
(a) Which of these compounds contains ferric $\left(F{e}^{3+}\right)$ ion?
(b) What is the number of electrons present in the d-sub-shell of $F{e}^{3+}$ ion? Find out by writing the sub-shell's electronic configuration.
[Given: Atomic number of Fe is 26]

Answer 1

(a) $F{e}_2(S{O}_4{)}_3$
(b) The sub-shell electronic configuration of $F{e}^{3+}$ ion is $1s^{2}2s^{2}2p^{6}3s^{2}3p^{6}3d^5$. There are 5 electrons in the d-sub-shell.