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Per NCERT §2.6.4 (Aufbau), what is the standard filling order of orbitals in the ground state for the first several shells?
A1s, 2s, 2p, 3s, 3p, 4s, 3d, 4p, 5s, 4d, 5p, 6s, 4f, 5d, 6p, 7s …
BFill all orbitals of one n before moving to n+1
C2s, 1s, 3s, 2p …
D1s, 2s, 2p, 3s, 3p, 3d, 4s …
Answer & Solution
Correct answer: A. 1s, 2s, 2p, 3s, 3p, 4s, 3d, 4p, 5s, 4d, 5p, 6s, 4f, 5d, 6p, 7s …
Per NCERT §2.6.4 Aufbau, the order is 1s 2s 2p 3s 3p 4s 3d 4p 5s 4d 5p 6s 4f 5d 6p 7s …, traced via the (n+l) diagonal rule.
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