How much energy is needed to remove the electron from the n = 2 level of a hydrogen atom (Eₙ = −13.6/n² eV)?
Correct answer A. 3.4 eV
Explanation
E₂ = −13.6 ÷ 2² = −3.4 eV. Removing the electron to n = ∞ (energy zero) requires +3.4 eV. 10.2 eV is the 1 → 2 excitation energy.
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