The ratio of the total energy of the 2 nd orbit electron for the hydrogen atom ( ¹H) to that of a helium ion ( He⁺) is: (a) 4 (b) 2 (c) 1/2 (d) 1/4

Answer: (d). En ∝ (Z²)/(n²); same n = 2, so E ∝ Z². EHEHe⁺ = (1²)/(2²) = 1/4 So the answer is (d) 1/4.

The ratio of the total energy of the 2 nd orbit electron for the… | MHT CET 2025 (5 May, Shift 2)

Q9MHT CET 2025 · 5 MAY · SHIFT 2Medium

Energy of the Electron & Energy Levels

The ratio of the total energy of the $2$ nd orbit electron for the hydrogen atom ( ${}^{1}\text{H}$ ) to that of a helium ion ( $\text{He}^{+}$ ) is:

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Answer: (d)

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