Q81 · CSIR-NET Chemistry, June 2016

Paper: CSIR-NET June 2016 · Subject: Physical Chemistry · Chapter: Quantum Chemistry · Topic: Hydrogen Atom · Marks: 2 · Difficulty: Medium

The orbital degeneracy of the level of a one-electron atomic system with $\mathrm{Z}=5$ and energy $=-13.6 \mathrm{eV}$, is

(a)1

(b)5

(c)25

(d)36

Answer

Answer: C ✓ checked by 4AB · confidence high

The source book printed no answer; this one was worked out and checked — see the explanation.

Explanation

E = −13.6 Z²/n² = −13.6 eV with Z = 5 ⇒ n² = 25 ⇒ n = 5; orbital degeneracy n² = 25.

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