For which one of the following, Bohr model is not valid ?

1. Hydrogen atom

2. Singly ionised helium atom (He\(^+\))

3. Deuteron atom

4. Singly ionised neon atom (Ne\(^+\))

Doubtly Asked 30 Oct 2026 NEET UG 2020 Practice test neet Save WhatsApp Report

1 answer

Best answer

Answer: 4. Singly ionised neon atom (Ne\(^+\))

The Bohr model works only for one-electron (hydrogen-like) systems, where the electron feels just the nucleus.

H, \(\mathrm{He^+}\) and a deuteron atom (hydrogen isotope) each have a single electron, so the model applies.
\(\mathrm{Ne^+}\) has nine electrons. Electron-electron repulsion makes the model invalid.

Hence option 4.

Doubtly AI · 30 Oct 2026 AI-generated · not yet verified Report

Was this answer helpful?