How much energy frees an electron from a hydrogen atom already in the n = 2 state?
A3.40 eV
B10.2 eV
C13.6 eV
D6.80 eV
Answer & Solution
Correct answer: A. 3.40 eV
The n = 2 level lies at -3.40 eV, so 3.40 eV lifts the electron to zero energy.
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