MEDIUMMCQ SINGLEIChO (Chemistry Olympiad)Physical ChemistryAtomic StructureIntro

Which of the following electronic transitions in a hydrogen atom will require the largest amount of energy?

0.From n = 1 to n = 2

1.From n = 2 to n = 3

2.From n = ∞ to n = 1

3.From n = 3 to n = 5

Explanation

ΔE(n=1→n=2) = 13.6(1 − 1/4) = 10.2 eV. ΔE(n=2→n=3) = 1.89 eV. ΔE(n=3→n=5) = 0.97 eV. Option (c) n=∞ to n=1 would be −13.6 eV (emission). Among given absorption transitions, n=1 to n=2 is largest.

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