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 $Z=5$ 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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