(bonus) explain which electrons are lost when Fe forms the $Fe^{+2}$ ion & why. Fe electron config: $1s^22s^22p^63s^23p^63d^64s^2$
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Step 1: The electronic configuration of Fe is $1s^22s^22p^63s^23p^63d^64s^2$. Show more…
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When Fe2+ forms, the neutral iron atom . (A) loses one electron from the 3d subshell and one electron from the 4s subshell. (B) loses two electrons from the 3d subshell. (C) loses one electron from the 4s subshell and one electron from the 4p subshell. (D) loses two electrons from the 4s subshell. (E) gains two electrons in its 4p subshell.
Madhur L.
Iron forms two monatomic ions, $\mathrm{Fe}^{3+}$ and $\mathrm{Fe}^{2+}$. From which sublevels do you expect electrons are lost in forming these ions? (Hint: It is possible for electrons other than those in the $s$ and $p$ sublevels to be involved in forming ions.)
What are the quantum numbers of the electrons that are lost by an atom of iron when it forms the ion $\mathrm{Fe}^{2+}$ ?
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