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Answer first
Atomic Structure PYQs (previous year questions) for JEE Main: Atomic Structure (Chemistry) had 14 questions across the 11 official JEE Main papers we tagged (2016–2026), and appeared in 11 of them. Asked in 3 of 3 years. The concepts asked in the most papers: Bohr Model, Hydrogen Spectrum, Hydrogen-like Species.
Year-wise question count
Asked in 3 of 3 years.
| Year | Papers | Questions | Per paper |
|---|---|---|---|
| JEE Main 2026 | 9 | 12 | 1.3 |
| JEE Main 2017 | 1 | 1 | 1 |
| JEE Main 2016 | 1 | 1 | 1 |
Most-asked concepts
Sorted by the number of papers a concept appeared in.
| Concept | Questions | Papers | Years |
|---|---|---|---|
| Bohr Model | 3 | 3 | 2026, 2017 |
| Hydrogen Spectrum | 2 | 2 | 2026 |
| Aufbau Principle | 1 | 1 | 2026 |
| de Broglie Wavelength | 1 | 1 | 2016 |
| Hydrogen-like Species | 1 | 1 | 2026 |
| Nodes in Orbitals | 1 | 1 | 2026 |
| Orbital Energies | 1 | 1 | 2026 |
| Photoelectric Effect | 1 | 1 | 2026 |
| Photon Energy | 1 | 1 | 2026 |
| Quantum Mechanical Model | 1 | 1 | 2026 |
| Quantum Numbers | 1 | 1 | 2026 |
How to practise Atomic Structure PYQs
- Start with the concepts at the top of the table. They have come back the most.
- Solve one year’s Atomic Structure questions from the official PDF against the clock, then check the answer listed below.
- Log every miss as a concept gap, a calculation slip or a misread. Each needs a different fix.
- Once a concept is clean in two papers, move to the next. Then sit a full paper from the year pages.
Questions by year
Each line gives the question number and paper, type, concept, our one-line summary and the official answer, with a link to the official PDF.
JEE Main2026
- Q.52 (2 April, shift 1) · MCQ · Hydrogen-like Species: Energy needed to ionise Li2+ using hydrogen ionization energy (official answer: option 3) PDF
- Q.71 (2 April, shift 2) · Numerical · Photoelectric Effect: Wavelength of radiation from work function and kinetic energy of electrons (official answer: 5) PDF
- Q.52 (4 April, shift 1) · MCQ · Hydrogen Spectrum: Ratio of wave numbers of first Balmer and first Brackett lines (official answer: option 2) PDF
- Q.53 (4 April, shift 1) · MCQ · Quantum Numbers: Quantum numbers of the 19th electron of chromium (official answer: option 4) PDF
- Q.52 (4 April, shift 2) · MCQ · Bohr Model: Species with identical Bohr radii for given orbits (official answer: option 2) PDF
- Q.52 (5 April, shift 1) · MCQ · Aufbau Principle: Order of energies of orbitals given quantum numbers (official answer: option 4) PDF
- Q.53 (5 April, shift 1) · MCQ · Quantum Mechanical Model: Correct statements on uncertainty principle, orbital size and configurations (official answer: option 2) PDF
- Q.52 (5 April, shift 2) · MCQ · Orbital Energies: True statements on orbital energy, size and radial nodes (official answer: option 2) PDF
- Q.52 (6 April, shift 1) · MCQ · Hydrogen Spectrum: Longest Balmer wavelength of He+ in terms of shortest Lyman of H (official answer: option 1) PDF
- Q.53 (6 April, shift 1) · MCQ · Nodes in Orbitals: Match orbitals with radial nodes and nodal planes (official answer: option 4) PDF
- Q.52 (6 April, shift 2) · MCQ · Bohr Model: Identify species and orbit from given Bohr radius (official answer: option 4) PDF
- Q.73 (8 April, shift 2) · Numerical · Photon Energy: Ratio of energies of radiations of 2000 and 6000 angstrom (official answer: 3) PDF
JEE Main2017
- Q.38 · MCQ · Bohr Model: Radius of second Bohr orbit of hydrogen PDF
JEE Main2016
- Q.33 · MCQ · de Broglie Wavelength: Momentum h/lambda of electrons accelerated through potential V PDF
Atomic Structure in other exams
The same chapter in other official papers we tagged: JEE Advanced (15 questions), NEET (1 question).
Other Chemistry chapters
- Some Basic Concepts in Chemistry PYQs
- Chemical Bonding and Molecular Structure PYQs
- Chemical Thermodynamics PYQs
- Solutions PYQs
- Equilibrium PYQs
- Redox Reactions and Electrochemistry PYQs
- Chemical Kinetics PYQs
- Classification of Elements and Periodicity PYQs
- p-Block Elements PYQs
- d- and f-Block Elements PYQs
- Coordination Compounds PYQs
- Purification and Characterisation of Organic Compounds PYQs
- Some Basic Principles of Organic Chemistry PYQs
- Hydrocarbons PYQs
- Organic Compounds Containing Halogens PYQs
- Organic Compounds Containing Oxygen PYQs
- Organic Compounds Containing Nitrogen PYQs
- Biomolecules PYQs
- Principles Related to Practical Chemistry PYQs
FAQ
How many Atomic Structure questions come in JEE Main?
In the official papers we tagged: 12 in 2026 (9 papers), 1 in 2017 (1 paper) and 1 in 2016 (1 paper). That is 14 questions in all, about 5% of Chemistry.
Which Atomic Structure topics repeat in JEE Main?
Asked in the most papers: Bohr Model, Hydrogen Spectrum, Hydrogen-like Species. The concept table lists every one with its count.
Are these official JEE Main questions?
Yes. Every question is from an official JEE Main paper hosted on our year pages. The one-line summaries are ours; open the PDF linked beside each question for the full text.