Which of the following order of energy level of orbitals are correct for single electronic system :-

Question

TestHub · Accepted Answer

(A) 2s = 2p

For a single-electron system, both orbitals have $n = 2$ .

So, energies are equal, which is correct.

(B) 4s > 3d

For a single-electron system, $n = 4$ vs $n = 3$ :

$E_{4} > E_{3} (l ess n e g a t i v e, hi g h ere n er g y)$

So, 4s has higher energy than 3d in a single-electron atom.

(C) 3p < 4s

$n = 3$ vs $n = 4$ → 3p is lower in energy than 4s.

(D) 4d > 5s

$n = 4$ vs $n = 5$ → 4d is lower in energy than 5s, because energy depends on $n$ only in a single-electron atom.

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