alleryFor He⁺ ion (1 electron, Z = 2), energy in ground state:
A-13.6 × 4 = -54.4 eV
B-13.6 eV
CSame as H
D-13.6 / 4
Answer & Solution
Correct answer: A. -13.6 × 4 = -54.4 eV
**For hydrogen-like ions:** E_n = -13.6 × Z²/n².
For He⁺ (Z = 2), n = 1: E = -13.6 × 4 = -54.4 eV.
Much more strongly bound than H (because higher Z attracts electron more).
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