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

1. Singly ionised helium atom (He⁺)
2. Deuteron atom
3. Singly ionised neon atom (Ne⁺)
4. Hydrogen atom

Correct answer: Singly ionised neon atom (Ne⁺)

Solution

The Bohr model is valid for single-electron systems like hydrogen, He⁺, and similar ions. However, Ne⁺ has multiple electrons, making the Bohr model inapplicable due to electron-electron interactions.

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