QJEEM03Ch5312: JEE Main 2003 Chemistry - Class 12 JEEM03Ch5312 Solution: The number of d-electrons retained in Fe 2+ (At no of Fe = 26)…

Fe (Z = 26) $$\to$$ e^- = 26

Fe²⁺ (Z = 26) $$\to$$ e^- = 24

Electronic configuration:

Fe (Z = 26) $$\to$$ 1s² 2s² 2p⁶ 3s² 3p⁶ 3d⁶ 4s²

Fe²⁺ (Z = 26) $$\to$$ 1s² 2s² 2p⁶ 3s² 3p⁶ 3d⁶ 4s⁰

as 4s is the outermost shell of Fe that's why e^- will always removed first from 4s, so retained e^- in d-shell is 6