For which one of the following, Bohr model is not valid? (a) Singly ionised helium atom (He+) (b) Deuteron atom (c) Singly ionised neon atom (Ne+) (d) Hydrogen atom

Answer: (c). Bohr model works only for one-electron (hydrogen-like) systems. He ⁺, deuterium and hydrogen each have one electron; Ne ⁺ has 9 electrons. So the answer is (c) Ne ⁺.

For which one of the following, Bohr model is not valid? | NEET 2020 (Phase 1)

Q94NEET 2020 · PHASE 1Easy

Bohr Model: Orbits, Speed & Angular Momentum

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

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Answer: (c)

Bohr model works only for one-electron (hydrogen-like) systems.
He $^+$ , deuterium and hydrogen each have one electron; Ne $^+$ has 9 electrons.
So the answer is (c) Ne $^+$ .

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