Which one is the electronic configuration of fe+2, Chemistry

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Which one is the electronic configuration of Fe+2:

(1) 1s2, 2s2, 2p6, 3s2, 3p6, 3d       

(2) 1s2, 2s2, 2p6, 3s2, 3p4, 4s2

(3) 1s2, 2s2, 2p6, 3s2, 3p6, 3d5, 4s1            

(4) None of these

Ans: 1s2, 2s2, 2p6, 3s2, 3p6, 3d6

 


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