What is the electronic configuration of the Fe²⁺ ion (Fe, Z = 26)?
Correct answer C. [Ar]3d⁶
Explanation
Iron is [Ar]3d⁶4s². On ionisation the two 4s electrons are lost before any 3d electrons, because 4s is higher in energy once 3d is occupied, so Fe²⁺ is [Ar]3d⁶.
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