Q78 · CSIR-NET Chemistry, June 2016

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

The ionization energy of hydrogen atom in its ground state is approximately 13.6 eV . The potential energy of $\mathrm{He}^{+}$, in its ground state is approximately

(a)-54.4 eV

(b)-27.2 eV

(c)-13.6 eV

(d)-108.8 eV

Answer

Answer: D ✓ checked by 4AB · confidence high

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

Explanation

E(He⁺, 1s) = −13.6 × Z² = −54.4 eV; by the virial theorem V = 2E = −108.8 eV.

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