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MCQ
What is the electronic configuration of Fe2+ (atomic number 26)?
Chemistry
A [Ar] 3d6 4s2
B [Ar] 3d6
C [Ar] 3d5 4s1
D [Ar] 3d8
Explanation

Fe has configuration [Ar] 3d6 4s2. When forming Fe2+, two electrons are removed from 4s first, giving [Ar] 3d6.

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