MEDIUMMCQ SINGLEJEE Mains ChemistryPhysical ChemistryAtomic StructureIntro

[NEET 2019] 4d, 5p, 5f and 6p orbitals are arranged in order of decreasing energy. The correct option is

0.5f > 6p > 4d > 5p

1.5f > 6p > 5p > 4d

2.6p > 5f > 5p > 4d

3.6p > 5f > 4d > 5p

Explanation

(n+l) values: 4d=6, 5p=6, 5f=8, 6p=7. Increasing (n+l) → higher energy. So 5f(8) > 6p(7) > 5p(6)=4d(6). For same (n+l)=6: higher n → higher energy, so 5p > 4d. Order: 5f > 6p > 5p > 4d.

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