NEET UG 2020 · Physics · Question 136
NEET 2020 Physics, question 136
Question 136 of the NEET 2020 paper (code E1) is a Physics question from Atoms. Its idea, Valid Hydrogen-like Species, was asked only this once in NEET 2017–2026. The NTA final answer key gives option 4.
Updated 2026-10-08
Q136 · Physics
For which one of the following, Bohr model is not valid ?
- 1Hydrogen atom
- 2Singly ionised helium atom ()
- 3Deuteron atom
- 4Singly ionised neon atom ()Official answer
Official answer: option 4 · NTA final answer key
Same idea
The only question on Valid Hydrogen-like Species
No other NEET paper from 2017–2026 tested this exact idea.
Valid Hydrogen-like Species: every question and how it was framed
The chapter
Atoms in ten years of NEET
13 questions from 2017–2026, asked in 9 of 10 papers, about 1.3 a paper. Bohr's Atomic Model alone had 13.