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Homework Statement
What energy (in eV) is required to remove the remaining electron from a singly ionized helium
atom, He+ (Z = 2)?
(a) 3.40 eV (c) 27.2 eV (e) 76.9 eV
(b) 13.6 eV (d) 54.4 eV
Homework Equations
Ei - Ef = hf
The Attempt at a Solution
Ef: the 1st level
Ei: the 2nd level