JEE Main Atoms and Nuclei: Weightage, Key Concepts and Study Plan
Atoms and Nuclei in JEE Main: 163 questions across 2022–2026, rank #8 of 20 in Physics, stable momentum. Year-wise data, key concepts and a study plan.
Edurack
October 21, 2026
Atoms and Nuclei is a dependable mid-weight chapter in JEE Main Physics, ranked #8 of 20 with 5.5% of recent questions. Here is what five years of JEE Main questions say about it, and how to prepare.
At a glance
- 163 questions across 2022–2026, all shifts
- 5.6% of Physics over five years and 5.5% in 2024–2026
- Rank #8 of 20 Physics chapters by recent weight
- Momentum: Stable
- Asked in 5 of 5 years; busiest year 2023 with 46 questions
- 24 questions in the 2026 papers
Year-wise questions
| Year | 2022 | 2023 | 2024 | 2025 | 2026 | Total |
|---|---|---|---|---|---|---|
| Questions | 31 | 46 | 39 | 23 | 24 | 163 |
How Atoms and Nuclei compares inside Physics
| Rank | Chapter | Total Qs | 2024–26 share | Momentum |
|---|---|---|---|---|
| 6 | Electromagnetic Induction and Alternating Currents | 177 | 5.7% | Stable |
| 7 | Rotational Motion | 140 | 5.7% | Gaining |
| 8 | Atoms and Nuclei | 163 | 5.5% | Stable |
| 9 | Kinematics | 171 | 5.4% | Stable |
| 10 | Physics and Measurement | 116 | 5.3% | Gaining |
Concepts that repeat
These specific ideas came back most often inside Atoms and Nuclei.
| Concept | 2022 | 2023 | 2024 | 2025 | 2026 | Total |
|---|---|---|---|---|---|---|
| Line Spectra of Hydrogen Atom | 8 | 3 | 8 | 2 | 3 | 24 |
| Law of Radioactive Decay | 6 | 5 | 7 | 1 | 1 | 20 |
| Radioactivity | 10 | 8 | 2 | 0 | 0 | 20 |
Start your practice with these. Each one has appeared in several different years, so it is worth knowing the question styles.
What the 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.
A checklist to tick off:
- 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
What to focus on
Bohr-model energy-level and spectral-line calculations, then binding energy, mass defect and radioactive decay arithmetic. These are formula-plus-arithmetic questions that reward speed.
A study plan for this chapter
Treat it as a dependable source of marks and keep it in your regular revision cycle. If you divide your Physics time in proportion to recent weightage, this chapter earns about 6% of it.
- Days 1–4: theory and solved examples.
- Days 5–9: chapter-wise PYQs and error log.
- Ongoing: a short revision every ten days.
Keep reading
- The full ranking: JEE Main Physics chapter-wise weightage
- Next chapter by weight: Kinematics
- A heavier neighbour: Rotational Motion
See Atoms and Nuclei on the weightage page →
Frequently Asked Questions
How many questions has Atoms and Nuclei had in JEE Main?
163 questions across 2022–2026, counting every shift: 2022: 31, 2023: 46, 2024: 39, 2025: 23, 2026: 24.
Is Atoms and Nuclei important for JEE Main Physics?
It ranks #8 of 20 Physics chapters by recent weight, which puts it in tier 2 of 3 for preparation. Its momentum is labelled Stable.
How should I start Atoms and Nuclei?
Bohr-model energy-level and spectral-line calculations, then binding energy, mass defect and radioactive decay arithmetic. Then solve chapter-wise previous-year questions.