JEE Main Atoms and Nuclei weightage 2022–2026
Physics
Atoms and Nuclei contributed 163 of the 2,905 JEE Main Physics questions asked across all shifts between 2022 and 2026 — 5.6% of the subject. In 2024–2026 its share was 5.5%, which makes it the #8 chapter of 20 in the current syllabus by recent weightage (about 1.8% of the whole paper).
Year by year it was asked 31 in 2022, 46 in 2023, 39 in 2024, 23 in 2025 and 24 in 2026. It appeared in 5 of 5 years, with its highest count in 2023.
Its share has stayed fairly steady: 5.5% of the Physics paper on average in 2024–2026, against 5.8% in 2022–2023.
The most repeated concepts from this chapter in the dataset are Line Spectra of Hydrogen Atom (24 questions), Law of Radioactive Decay (20 questions) and Radioactivity (20 questions).
Questions
163
5.6% of Physics
Share 2024–2026
5.5%
2022–2023: 5.8% avg
Rank in subject
#8
of 20 chapters
Years asked
5 of 5
Questions per year
Share of the Physics paper by year: 2022 4.9% · 2023 6.7% · 2024 6.5% · 2025 4.8% · 2026 5.1%
What the JEE Main syllabus covers
Alpha-particle scattering, Rutherford and Bohr models, energy levels, hydrogen spectrum, nuclear composition and size, mass-energy relation, mass defect, binding energy, fission and fusion.
Most repeated concepts in Atoms and Nuclei
| # | Concept | 2022 | 2023 | 2024 | 2025 | 2026 | Total |
|---|---|---|---|---|---|---|---|
| 1 | Line Spectra of Hydrogen AtomAtoms and Nuclei | 8 | 3 | 8 | 2 | 3 | 24 |
| 2 | Law of Radioactive DecayAtoms and Nuclei | 6 | 5 | 7 | 1 | 1 | 20 |
| 3 | RadioactivityAtoms and Nuclei | 10 | 8 | 2 | – | – | 20 |
Frequently asked questions
How many questions come from Atoms and Nuclei in JEE Main?
Atoms and Nuclei had 163 questions across all JEE Main shifts from 2022 to 2026, which is 5.6% of Physics. Year by year: 31 in 2022, 46 in 2023, 39 in 2024, 23 in 2025 and 24 in 2026.
Is Atoms and Nuclei important for JEE Main?
It ranks #8 of 20 Physics chapters by share of questions in 2024–2026 (5.5% of the subject). Its share has been steady.
Which Atoms and Nuclei concepts are asked most in JEE Main?
Line Spectra of Hydrogen Atom (24 questions), Law of Radioactive Decay (20 questions) and Radioactivity (20 questions) are the most repeated concepts from this chapter in the dataset.
What does the JEE Main syllabus cover in Atoms and Nuclei?
Alpha-particle scattering, Rutherford and Bohr models, energy levels, hydrogen spectrum, nuclear composition and size, mass-energy relation, mass defect, binding energy, fission and fusion.
Does a high weightage mean Atoms and Nuclei will be asked again?
No. Weightage shows past frequency, not a promise. Use it to prioritise, and practise previous-year questions to see how the chapter is tested.
Practise JEE Main Physics PYQs
Solve JEE previous-year questions with solutions on Edurack.
More JEE Main guides
Counts are compiled from Edurack's JEE Main last five-year analysis (2022–2026) and count questions across all shifts and sessions of each year. Because the number of shifts changes every year, trends compare each chapter's share of the paper among chapters still in the syllabus, not raw counts. Past frequency is a trend guide, not a prediction. Chapters marked "not in syllabus" are absent from NTA's JEE Main 2026 syllabus; always check the latest NTA syllabus before skipping a chapter.