Atomic number of Mn is 25 what is the electronic configuration in the ground state

Question:Atomic number of Mn is 25 what is the electronic configuration in the ground state

1.1s2 2s2 2p6 3s2 3p6 3d7

2.1s2 2s2 2p6 3s2 3p6 4s2 4p5

3.1s2 2s2 2p6 3s2 3p5 3d10

4.1s2 2s2 2p6 3s2 3p6 4s23d5


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