What is the electronic configuration of the Fe³⁺ ion (Z of Fe = 26)?
Correct answer C. [Ar] 3d⁵
Explanation
Fe is [Ar]3d⁶4s². On ionisation the 4s electrons are lost first, then one 3d electron, giving Fe³⁺ as [Ar]3d⁵. The half-filled 3d subshell makes this ion fairly stable.
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