Easy
Which one is the electronic configuration of $Fe^{2+}$?
- A$1s^2, 2s^2 2p^6, 3s^2 3p^6 3d^6$
- B$1s^2, 2s^2 2p^6, 3s^2 3p^6 3d^4, 4s^2$
- C$1s^2, 2s^2 2p^6, 3s^2 3p^6 3d^5, 4s^1$
- DNone of these
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