MEDIUMMCQ SINGLENEET ChemistryPhysical ChemistryAtomic StructureIntro

[CBSE AIPMT 2011] If n = 6, the correct sequence of filling of electrons will be

0.ns, np, (n−1)d, (n−2)f

1.ns, (n−2)f, (n−1)d, np

2.ns, (n−1)d, (n−2)f, np

3.ns, (n−2)f, np, (n−1)d

Explanation

For n=6: (n+l) values: 6s=6, 6p=7, 5d=7, 4f=7. For same (n+l), lower n fills first: 4f before 5d before 6p. Order: 6s < 4f < 5d < 6p → ns, (n−2)f, (n−1)d, np.

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