JEE Main 2025 — Structure Of Atom Question with Solution
From: JEE Main 2025 (Online) 22nd January Morning Shift
Question
Radius of the first excited state of Helium ion is given as : radius of first stationary state of hydrogen atom.
Choose an option
Show full solutionCorrect option: B
Step-by-step explanation
For the helium ion, which is hydrogen-like with a nuclear charge of , the first excited state corresponds to . Substituting these values:
Thus, the radius of the first excited state of the helium ion is .
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This is a previous-year question from JEE Main 2025, covering the Structure Of Atom chapter of Chemistry. PrepSharp catalogues every PYQ from JEE Main with a verified answer key and step-by-step solution prepared by IIT alumni — so you can search by chapter, topic or year and revise efficiently.