What is the energy of the electron in the n = 3 orbit of a hydrogen atom (Eₙ = −13.6/n² eV)?
Correct answer D. −1.51 eV
Explanation
Substituting n = 3 gives Eₙ = −13.6 ÷ 9 = −1.51 eV. The negative sign shows that the electron is bound to the nucleus.
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