The electronic configuration & atomic number, Chemistry

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The electronic configuration (outermost) of Mn⁺² ion (atomic number of Mn= 25 ) in its ground state is:

(1) 3d⁵, 4s^o

(2) 3d⁴, 4s¹

(3) 3d^3, 4s²

(4) 3d², 4s², 4p²

Ans: 3d⁵, 4s^o

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