How much energy is needed to ionise a hydrogen atom whose electron is in the n = 2 level (Eₙ = −13.6/n² eV)?
Correct answer D. 3.4 eV
Explanation
The energy of the n = 2 level is E₂ = −13.6/4 = −3.4 eV. Removing the electron to n = ∞, where E = 0, therefore requires 3.4 eV.
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