Practice question
Question
In a hydrogen atom, the energy of an electron in the first orbit is -2.18 × 10⁻¹⁸ J. What is the energy of the electron in the third orbit?
Explanation
Eₙ = -2.18×10⁻¹⁸ / n². E₃ = -2.18×10⁻¹⁸ / 9 = -2.4222×10⁻¹⁹ J.
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