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The order of filling of electrons in the orbitals of an atom will be:
(1) 3d, 4s, 4p, 4d, 5s,
(2) 4s, 3d, 4p, 5s, 4d
(3) 5s, 4p, 3d, 4d, 5s,
(4) 3d, 4p, 4s, 4d, 5s,
Ans: 4s, 3d, 4p, 5s, 4d
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