alleryFor He⁺ ion (Z = 2), energy of n=1 (ground state):
ASame as H
B-13.6 eV
C-13.6 / 4
D-13.6 × Z²/n² = -54.4 eV
Answer & Solution
Correct answer: D. -13.6 × Z²/n² = -54.4 eV
**For hydrogen-like ion (one electron):** E_n = -13.6 × Z²/n² eV.
For He⁺ (Z = 2), n = 1: -13.6 × 4 = -54.4 eV.
Bound much more strongly than H (4× more).
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