Atomic Structure is an important chapter in Chemistry, it contributes around 3-7% weightage of the total marks in the exam which is about 2-3 questions.
This subject covers important concepts such as Bohr's atomic model, de Broglie's idea of matter waves, quantum numbers, and Heisenberg's uncertainty principle. Atomic Structure questions are very commonly asked in JEE Mains.
The JEE Main Chemistry follows the revised exam pattern, 20 multiple-choice questions (MCQs) and 5 numerical-based questions. The NTA has removed the optional questions, as per the revised exam pattern the candidates are required to answer all 25 questions in JEE Main Chemistry.
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Listed below is the list of Atomic Structure questions with detailed solutions asked in JEE Main.
Question 1.
Which of the following is/are correct with respect to the energy of atomic orbitals of a hydrogen atom?
(A) 1s < 2s < 2p < 3d < 4s
(B) 1s < 2s = 2p < 3s = 3p
(C) 1s < 2s < 2p < 3s < 3p
(D) 1s < 2s < 4s < 3d < 4p
Choose the correct answer from the options given below: [JEE Main 2025]
A. (A) and (C) only
B. (A) and (B) only
C. (C) and (D) only
D. (B) and (D) only
Question 2.
The number of radial node/s for 3p orbital is: [JEE Main 2024]
A. 1
B. 4
C. 2
D. 3
Question 3.
Question 4.
Question 5.
Question 6.
Question 7.
Question 8.
The incorrect postulates of Dalton's atomic theory are :
(A) Atoms of different elements differ in mass.
(B) Matter consists of divisible atoms.
(C) Compounds are formed when atoms of different elements combine in a fixed ratio.
(D) All the atoms of a given element have different properties including mass.
(E) Chemical reactions involve reorganisation of atoms.
Choose the correct answer from the options given below: [JEE Main 2024]
A. (B), (D), (E) only
B. (A), (B), (C) only
C. (C), (D), (E) only
D. (B), (D) only
Question 9.
Question 10.
Question 11.
Question 12.
Question 13.
Number of spectral lines obtained in He\(^+\) spectra, when an electron makes a transition from the fifth excited state to the first excited state will be _________. [JEE Main 2024]
Question 14.
- A-IV, B-III, C-II, D-I
- A-III, B-II, C-I, D-IV
- A-I, B-IV, C-III, D-II
- A-II, B-I, C-IV, D-III
Question15
JEE Main Chemistry Paper Pattern
JEE Main Chemistry Chapter - Wise Weightage
The JEE Main 2025 Chemistry Chapter is divided into 3 sections i.e. Inorganic Chemistry, Organic Chemistry, and Physical Chemistry.
The major topics in Inorganic Chemistry are, Transition Elements, Coordination Compounds, and Periodic Table and p-Block Elements account for 9.9% (3-4 questions). Whereas, Atomic Structure, Chemical Bonding, and Environmental Chemistry account for 6.6% each, or about 2 questions.
In Organic Chemistry, the Biomolecules, Carbohydrates, and Carboxylic Acids chapters hold 6.6% weightage each. Aromatic Compounds and Hydrocarbons sections have 3.3%, so organic chemistry is an important subject.
The Physical Chemistry chapters of Chemical Kinetics and Electrochemistry hold 3.3% each or 1 question each. They are compulsory but have less weightage as compared to inorganic and organic chemistry.
JEE Main 2025 Chemistry Chapter-Wise Weightage
| Chapter | Approximate Weightage (%) | Number of Questions |
|---|---|---|
| Transition Elements and Coordination Compounds | 9.9% | 3-4 |
| Periodic Table and p-Block Elements | 9.9% | 3-4 |
| Atomic Structure | 6.6% | 2 |
| Nuclear and Environmental Chemistry | 6.6% | 2 |
| Chemical Bonding and Molecular Structure | 6.6% | 2 |
| Chemical and Ionic Equilibrium | 6.6% | 2 |
| Thermodynamics and the Gaseous State | 6.6% | 2 |
| Biomolecules | 6.6% | 2 |
| Carbohydrates, Amino Acids, and Polymers | 6.6% | 2 |
| Carboxylic Acids and their Derivatives | 6.6% | 2 |
| Aromatic Compounds | 6.6% | 2 |
| General Organic Chemistry | 3.3% | 1 |
| Stereochemistry | 3.3% | 1 |
| Hydrocarbons | 3.3% | 1 |
| Alkyl Halides | 3.3% | 1 |
| Solutions and Colligative Properties | 3.3% | 1 |
| Electrochemistry | 3.3% | 1 |
| Chemical Kinetics | 3.3% | 1 |
| Redox Reactions | 3.3% | 1 |
| Mole Concept | 3.3% | 1 |
| Solid State and Surface Chemistry | 3.3% | 1 |
| Transition Elements | 3.3% | 1 |
| Coordination Compounds | 3.3% | 1 |
| General Principles of Metallurgy | 3.3% | 1 |
- The inorganic Chemistry section has the highest weightage of 35% in the JEE Main Chemistry Paper.
- Organic Chemistry has a weightage of approx 20-25%.
- Physical Chemistry is about 15-20% of the total questions.
JEE Main Last 5 Year Chemistry Papers Pdf
JEE Main 2024 Chemistry Question Paper Session 1
| Exam Date | Question Paper | Solution PDF |
|---|---|---|
| JEE Main 2024 Feb 1 Shift 2 Chemistry Question Paper | Download | Check Solution |
| JEE Main 2024 Feb 1 Shift 1 Chemistry Question Paper | Download | Check Solution |
| JEE Main 2024 Jan 31 Shift 2 Chemistry Question Paper | Download | Check Solution |
| JEE Main 2024 Jan 31 Shift 1 Chemistry Question Paper | Download | Check Solution |
| JEE Main 2024 Jan 30 Shift 2 Chemistry Question Paper | Download | Check Solution |
| JEE Main 2024 Jan 30 Shift 1 Chemistry Question Paper | Download | Check Solution |
| JEE Main 2024 Jan 29 Shift 2 Chemistry Question Paper | Download | Check Solution |
| JEE Main 2024 Jan 29 Shift 1 Chemistry Question Paper | Download | Check Solution |
| JEE Main 2024 Jan 27 Shift 2 Chemistry Question Paper | Download | Check Solution |
| JEE Main 2024 Jan 27 Shift 1 Chemistry Question Paper | Download | Check Solution |
JEE Main 2024 Chemistry Question Paper Session 2
| Exam Date and Shift | Question Paper | Solution PDF |
|---|---|---|
| JEE Main 2024 April 4 Shift 1 Chemistry Question Paper | Download | Check Solution |
| JEE Main 2024 April 4 Shift 2 Chemistry Question Paper | Download | Check Solution |
| JEE Main 2024 April 5 Shift 1 Chemistry Question Paper | Download | Check Solution |
| JEE Main 2024 April 5 Shift 2 Chemistry Question Paper | Download | Check Solution |
| JEE Main 2024 April 6 Shift 1 Chemistry Question Paper | Download | Check Solution |
| JEE Main 2024 April 6 Shift 2 Chemistry Question Paper | Download | Check Solution |
| JEE Main 2024 April 8 Shift 1 Chemistry Question Paper | Download | Check Solution |
| JEE Main 2024 April 8 Shift 2 Chemistry Question Paper | Download | Check Solution |
| JEE Main 2024 April 9 Shift 1 Chemistry Question Paper | Download | Check Solution |
| JEE Main 2024 April 9 Shift 2 Chemistry Question Paper | Download | Check Solution |
JEE Main 2023 Chemistry Question Paper Session 2
| Exam Date | Chemistry Question Paper 2023 |
|---|---|
| Chemistry 6 April Shift 1 Question Paper | Check Here |
| Chemistry 6 April Shift 2 Question Paper | Check Here |
| Chemistry 8 April Shift 1 Question Paper | Check Here |
| Chemistry 8 April Shift 2 Question Paper | Check Here |
| Chemistry 10 April Shift 1 Question Paper | Check Here |
| Chemistry 10 April Shift 2 Question Paper | Check Here |
| Chemistry 11 April Shift 1 Question Paper | Check Here |
| Chemistry 11 April Shift 2 Question Paper | Check Here |
| Chemistry 12 April Shift 1 Question Paper | Check Here |
| Chemistry 13 April Shift 1 Question Paper | Check Here |
| Chemistry 13 April Shift 2 Question Paper | Check Here |
| Chemistry 15 April Shift 1 Question Paper | Check Here |
JEE Main 2023 Chemistry Question Paper Session 1
| Exam Date and Shift | Chemistry Question Paper 2023 |
|---|---|
| Chemistry 24 January Shift 1 Question Paper | Check Here |
| 2023 Chemistry 24 January Shift 2 Question Paper | Check Here |
| Chemistry 25 January Shift 1 Question Paper | Check Here |
| Chemistry 25 January Shift 2 Question Paper | Check Here |
| Chemistry 29 January Shift 1 Question Paper | Check Here |
| Chemistry 29 January Shift 2 Question Paper | Check Here |
| Chemistry 30 January Shift 1 Question Paper | Check Here |
| Chemistry 30 January Shift 2 Question Paper | Check Here |
| Chemistry 31 January Shift 1 Question Paper | Check Here |
| Chemistry 31 January Shift 2 Question Paper | Check Here |
| Chemistry 1 February Shift 1 Question Paper | Check Here |
| Chemistry 1 February Shift 2 Question Paper | Check Here |
JEE Main 2022 Chemistry Question Paper with Solution PDF- Phase 2
| Exam Date | Shift/ Slot | Question Paper PDF |
|---|---|---|
| July 25 | Shift 1 | Check Here |
| July 25 | Shift 2 | Check Here |
| July 26 | Shift 1 | Check Here |
| July 26 | Shift 2 | Check Here |
| July 27 | Shift 1 | Check Here |
| July 27 | Shift 2 | Check Here |
| July 28 | Shift 1 | Check Here |
| July 28 | Shift 2 | Check Here |
| July 29 | Shift 1 | Check Here |
| July 29 | Shift 2 | Check Here |
JEE Main 2022 Chemistry Question Paper with Solution PDF- Phase 1
| Exam Date | Shift/ Slot | Question Paper PDF |
|---|---|---|
| June 29 | Shift 1 | Check Here |
| June 29 | Shift 2 | Check Here |
| June 28 | Shift 1 | Check Here |
| June 28 | Shift 2 | Check Here |
| June 27 | Shift 1 | Check Here |
| June 27 | Shift 2 | Check Here |
| June 26 | Shift 1 | Check Here |
| June 26 | Shift 2 | Check Here |
| June 25 | Shift 1 | Check Here |
| June 25 | Shift 2 | Check Here |
| June 24 | Shift 1 | Check Here |
| June 24 | Shift 2 | Check Here |
JEE Main 2021 Chemistry Question Paper with Solution (Session 4- August)- Download PDF
| Exam Date | Shift/ Slot | Question Paper PDF |
|---|---|---|
| August 26 | Shift 1 | Check Here |
| August 26 | Shift 2 | Check Here |
| August 27 | Shift 1 | Check Here |
| August 27 | Shift 2 | Check Here |
| August 31 | Shift 1 | Check Here |
| August 31 | Shift 2 | Check Here |
| September 1 | Shift 2 | Check Here |
JEE Main 2021 Chemistry Question Paper with Solution (Session 3- July)- Download PDF
| Exam Date | Shift/ Slot | Question Paper PDF |
|---|---|---|
| July 22 | Shift 2 | Check Here |
| July 25 | Shift 1 | Check Here |
| July 25 | Shift 2 | Check Here |
| July 27 | Shift 1 | Check Here |
| August 3 | Shift 1 | Check Here |
| August 3 | Shift 2 | Check Here |
| August 4 | Shift 1 | Check Here |
| August 4 | Shift 2 | Check Here |
JEE Main 2021 Chemistry Question Paper with Solution (Session 2- March)- Download PDF
| Exam Date | Shift/ Slot | Question Paper PDF |
|---|---|---|
| March 16 | Shift 1 | Check Here |
| March 16 | Shift 2 | Check Here |
| March 17 | Shift 1 | Check Here |
| March 17 | Shift 2 | Check Here |
| March 18 | Shift 1 | Check Here |
| March 18 | Shift 2 | Check Here |
JEE Main 2021 Chemistry Question Paper with Solution (Session 1- February)- Download PDF
| Exam Date | Shift/ Slot | Question Paper PDF |
|---|---|---|
| February 24 | Shift 1 | Check Here |
| February 24 | Shift 2 | Check Here |
| February 25 | Shift 1 | Check Here |
| February 25 | Shift 2 | Check Here |
| February 26 | Shift 1 | Check Here |
| February 26 | Shift 2 | Check Here |
JEE Main 2020 Chemistry Question Paper with Solutions (Session 2- September)- Download PDF
| Exam Date | Shift/ Slot | JEE Main Question Paper PDF |
|---|---|---|
| September 2 | Shift 1 | Check Here |
| September 2 | Shift 2 | Check Here |
| September 3 | Shift 1 | Check Here |
| September 3 | Shift 2 | Check Here |
| September 4 | Shift 1 | Check Here |
| September 4 | Shift 2 | Check Here |
| September 5 | Shift 1 | Check Here |
| September 5 | Shift 2 | Check Here |
| September 6 | Shift 1 | Check Here |
| September 6 | Shift 2 | Check Here |
JEE Main 2020 Chemistry Question Paper with Solutions (Session 1- January)- Download PDF
| Exam Date | Shift/ Slot | JEE Main Question Paper PDF |
|---|---|---|
| January 8 | Shift 1 | Check Here |
| January 8 | Shift 2 | Check Here |
| January 9 | Shift 1 | Check Here |
| January 9 | Shift 2 | Check Here |
Important Topics Related to Atomic Structure Chemistry
- Relation Between Molarity and Molality: Definition & Formula
- NCERT Class 12 Chemistry Book PDF
- Structure of Atom Class 11 MCQ
Frequently Asked Questions
Q1. What is the weightage of atomic structure in JEE Mains?
Answer: The Atomic Structure in JEE Mains holds a weightage of 3-5% which is about 1-2 questions in the exam.
Topics Covered: Key topics include Bohr's model, de Broglie’s wavelength, quantum numbers, Heisenberg’s uncertainty principle, and the electron configuration of atoms. These concepts are frequently asked in the form of theoretical questions, numerical problems, and conceptual application-based questions.
Q2. Is atomic structure important for JEE Mains?
Answer: Yes, Atomic Structure is a very important subject for JEE Mains, and it has a 3-5% weightage in the JEE Main exam, in Physical Chemistry as well as in Modern Physics.
The Atomic Structure helps in understanding topics like chemical bonding, molecular orbital theory, and quantum mechanics.
JEE Main Chemistry Atomic Structure Previous Years Analysis
| Year | Number of Questions on Atomic Structure | Weightage |
|---|---|---|
| 2023 | 1-2 questions | 3-4% |
| 2022 | 1 question | 3% |
| 2021 | 2 questions | 5% |
| 2020 | 1-2 questions | 3-4% |
Q3. Is Atomic Structure a tough chapter?
Answer: The Atomic Structure chapter in JEE Mains is not tough, but it may be challenging for those students who have a poor understanding of the concept.
- The chapter can be easy and scorable if the right strategy is adopted, as this chapter is frequently featured in JEE Mains, it offers a good chance to earn easy marks if done well.
- With regular practice, clarity of concepts, and concentration on major topics such as Bohr's model, quantum numbers, and spectral lines, it becomes a lot easier.
Q4. Atomic structure important topics for JEE Mains
Answer: Atomic Structure is a key chapter of the JEE Mains syllabus because it helps in understanding several concepts of both Physical Chemistry and Modern Physics.
Atomic Structure has a weightage of approx 3-5% in JEE Mains, which amounts to around 1-2 questions.
| Topic | Frequency of Appearance in JEE Mains | Weightage |
| Bohr's Model and Energy Levels | Frequently in almost every year | 1-2 questions |
| Quantum Numbers and Electron Configuration | Common, especially in recent years | 1 question |
| de Broglie’s Hypothesis | Appears occasionally in numerical problems | 1 question |
| Heisenberg’s Uncertainty Principle | Rarely tested, but important | 1 question |
| Atomic Spectra and Rydberg’s Formula | Frequently in both JEE Mains and Advanced | 1 question |
| Photoelectric Effect | Occasionally tested in recent years | 1 question |
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