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

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A. 1s2 2s2 2p6 3s2 3p6 4s23d5
B. 1s2 2s2 2p6 3s2 3p5 3d10
C. 1s2 2s2 2p6 3s2 3p6 3d7
D. 1s2 2s2 2p6 3s2 3p6 4s2 4p5

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