Question
Write the electronic configuration of $Fe ^{+2}$.
✓
Answer
${ }_{26} Fe =1 s^2 2 s^2 2 p ^6 3 s^2 3 p ^6 3 d^6 4 s^2$
Hence $Fe ^{+2}=\left[\right.$ Ar] $3 d^6$
Hence $Fe ^{+2}=\left[\right.$ Ar] $3 d^6$
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