EASYMCQ SINGLEIChO (Chemistry Olympiad)Physical ChemistryAtomic StructureIntro
The energy of an electron in the 3rd orbit of hydrogen atom is
0.−1311.8 kJ mol⁻¹
1.−82.0 kJ mol⁻¹
2.−145.7 kJ mol⁻¹
3.−327.9 kJ mol⁻¹
Explanation
Eₙ = −1312 Z²/n² kJ mol⁻¹. For H (Z=1), n=3: E₃ = −1312/9 = −145.8 kJ mol⁻¹ ≈ −145.7 kJ mol⁻¹
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