MEDIUMMCQ SINGLEIChO (Chemistry Olympiad)Physical ChemistryAtomic StructureIntro
The most probable radius (in pm) for finding the electron in He⁺ is
0.0.0
1.52.9
2.26.5
3.105.8
Explanation
rₙ = 52.9 n²/Z pm. For He⁺ (Z=2), n=1: r = 52.9 × 1/2 = 26.45 ≈ 26.5 pm
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