Structure of Atom Weightage in JEE Mains 2025

Soham Mitra

Updated On: January 21, 2025 11:08 AM | JEE Main

Structure of Atom Weightage in JEE Mains 2025 is expected to be 6.6.% of total Chemisty Weightage. Candidates preparing for the exam can expect around 2 questions from this chapter. Check the important details related to the weightage of Structure of Atom in the JEE Mains exam along with important topics here.
Structure of Atom Weightage in JEE Mains 2025

Structure of Atom Weightage in JEE Mains 2025: The Chemistry chapters occupy eminent significance in the JEE Main entrance exam. JEE Main 2025 aspirants are required to prepare for all the subjects in the appropriate manner. JEE Main 2025 candidates must be aware of the chapter-wise weightage for each subject for effective preparation. The Structure of Atom Weightage in JEE Mains 2025 is estimated to be 6.6.% of the total Chemistry weightage. Based on the previous year's analysis, students can expect around 2 questions from this topic. Some topics with high weightage in the JEE Main Chemistry syllabus are Structure of Atoms, Chemical Bonding, Transition Elements & Coordination Chemistry, and Thermodynamics & Gaseous State amongst others. The Structure of Atom chapter is important as it deals with the physical and chemical properties of various atoms and molecules. Candidates can check the weightage and chapters in the Structure of Atom in the article.

Also Read: JEE Main 2025 Exam Pattern

An Overview of Structure of Atom

The Structure of Atom section of the JEE Main 205 Chemistry Syllabus is a fundamental chapter dealing with the composition, behaviour and properties of atoms which act as the building blocks of matter. The key concepts covered in Structure of Atom have been discussed below.

  • Subatomic Particles - These comprise electrons which are negatively charged particles discovered by J.J. Thomson via cathode ray experiments, protons which are positively charged particles discovered by Goldstein and neutrons which are neutral particles discovered by James Chadwick.
  • Atomic Models - Atomic models comprise various models which have been discussed below.
  1. Dalton's Atomic Theory - It states that atoms are indivisible and indestructible.
  2. Thomson's Model (Plum Pudding Model) - It describes an atom as a sphere of positive charge with electrons embedded in it.
  3. Rutherford’s Nuclear Model - It states that an atom has a dense, positively charged nucleus surrounded by electrons in empty space.
  4. Bohr’s Model - It states that electrons revolve in specific orbits with quantized energy.
  5. Quantum Mechanical Model - It describes electrons as wave functions with probabilistic distributions around the nucleus.
  • Quantum Mechanics - They comprise;
  1. Dual Nature of Matter and Radiation - It states that particles such as electrons exhibit both wave and particle properties.
  2. Heisenberg’s Uncertainty Principle: It states that it is impossible to simultaneously measure the position and momentum of a particle with absolute accuracy.
  3. Quantum Numbers- Principal (n) represents the shell, azimuthal (l) signifies the subshell or orbital shape, magnetic (m) signifies the orientation of orbitals and spin (s) represents the electron's spin direction.
  • Hydrogen Spectrum - It comprises;
  1. Line Spectrum: These are emission lines produced when electrons transition between energy levels.

2. Balmer, Lyman, Paschen, Brackett, and Pfund Series: They represent transitions in different spectral regions.

Also Read: JEE Main Previous Year Question Paper

Structure of Atom Weightage in JEE Mains 2025

Aspirants preparing for the JEE Main 2025 exam can check the Structure of Atom weightage in JEE Mains 2025 in the following table.

Units

Weightage in Percentage

No. of Questions

Structure of Atom

6.6%

2

JEE Main Structure of Atom Weightage 2024

Check the JEE Main 2024 Weightage of the Structure of the Atom in the following table

Chapter

Total Ques

Jan 27 Shift 1

Jan 27 Shift 2

Jan 29 Shift 1

Jan 29 Shift 2

Jan 30 Shift 1

Jan 30 Shift 2

Jan 31 Shift 1

Jan 31 Shift 2

Feb 1 Shift 1

Feb 1 Shift 2

Structure of Atom

13

4

1

1

1

1

1

1

1

1

1

Structure of Atom Weightage in JEE Main 2023

Given below is the JEE Main Structure of Atom Weightage 2023.

Chapter

Total Questions in Jan Session

Total Questions in April Session

Structure of Atom

14

15

JEE Main Structure of Atom Weightage 2022

Students can examine the JEE Main structure of atom weightage 2022 below.

Chapters

JEE Main Chemistry Questions in June Session

JEE Main Chemistry Questions in July Session

Structure of Atom

14

10

Structure of Atom Weightage in JEE Main 2021

Check the weightage of the Structure of the Atom for JEE Main 2021 in the following table.

Chapters

Total Questions in February Session

Total Questions in March Session

Total Questions in July Session

Structure of Atom

5

7

5

JEE Main Structure of Atom Weightage Chemistry (2020-2019)

Below is the weightage for the structure of atoms as covered in the JEE Main examinations for the years 2020 and 2019.

Chapters

Chapter Weightage 2020

Chapter Weightage 2019

Structure of Atom

13

18

Also Read: Best Books for JEE Main 2025

Best Books for JEE Mains 2025 Chemistry

Chemistry is one of the most difficult papers to crack in any competitive examination, as it comprises fundamental concepts. Below are a few of the best books, which help candidates to score good marks in the Chemistry section of the JEE Main entrance exam.

  • NCERT Textbooks for classes 11 and 12 by NCERT

  • Organic Chemistry by O P Tandon

  • Modern Approach to Chemical Calculations by R.C. Mukherjee

  • Organic Chemistry by Morrison & Boyd

  • Concept of Physical Chemistry by P Bahadur

Also Read | JEE Main Deleted Syllabus 2025

Type of Structure of Atom Questions in JEE Main 2025

In the JEE Main 2025 exam, questions on the structure of atoms generally cover a range of topics, emphasizing the key concepts and models. The type of questions JEE Main Structure of Atom section include:

In the JEE Main 2025 examination, questions from the Structure of Atom chapter generally test conceptual understanding, application of principles, and problem-solving skills. Based on trends and chapter importance, you can expect the following types of questions:

  • Conceptual Questions - They evaluate the understanding of basic principles such as Heisenberg's Uncertainty Principle, Postulates of Bohr's model and Quantum numbers and their significance.

  • Theoretical Questions - They evaluate the understanding of experimental results and models like Failures of classical mechanics leading to quantum mechanics, Line spectra and spectral series of hydrogen and Interpretation of Rutherford’s alpha-particle scattering experiment.

  • Numerical Problems - Such questions comprise calculations based upon De Broglie wavelength of particles, Photoelectric effect calculations, Energy levels and transitions in hydrogen-like atoms and Radius, velocity, and energy of electrons in Bohr’s orbits.

  • Assertion-Reason or Statement-Based Questions - They deal with critical thinking and understanding of cause-effect relationships such as linking classical and modern atomic theories and assertions about energy levels, quantum mechanics, or spectral lines.

  • Graph-based or Match-the-Column Questions - They comprise matching quantum numbers with atomic orbitals, trends in energy levels or spectral lines and graphs related to the photoelectric effect or probability distribution of electrons.

Also Read: Best JEE Main Coaching Institutes in India

Related Reads

Kinematics Weightage in JEE Mains 2025 Units and Dimensions Weightage in JEE Main 2025
Kinematics JEE Main Questions 2025 Laws of Motion Weightage in JEE Mains 2025
Laws of motion JEE Main Questions 2025 JEE Main Question Paper April 2024 with Answer Key Solutions
JEE Main 2025 Exam JEE Main Preparation Tips
JEE Main Exam Pattern Work Energy and Power JEE Main Questions 2025
Work Energy and Power Weightage in JEE Main 2025 Rotational Motion Weightage in JEE Main 2025
Rotational Motion JEE Main Questions 2025 Gravitation Weightage in JEE Main 2025
Gravitation JEE Main Questions 2025 Thermodynamics Weightage in JEE Mains 2025
Thermodynamics JEE Main Questions 2025 Kinetic Theory of Gases Weightage in JEE Main 2025
Kinetic Theory of Gases JEE Main Questions 2025 Oscillation Weightage in JEE Mains 2025
Electrostatics Weightage in JEE Main 2025 Electrostatics JEE Main Questions 2025
Current Electricity Weightage in JEE Main 2025 Current Electricity JEE Main Questions 2025
Magnetic Effects of Current Weightage in JEE Main 2025 Electromagnetic Waves Weightage in JEE Main 2025
Electromagnetic Waves JEE Main Questions 2025 Optics Weightage in JEE Main 2025
Optics JEE Main Questions 2025 Atoms and Nuclei Weightage in JEE Mains 2025
Structure of Atom JEE Main Questions 2025 Classification of Elements and Periodicity in Properties Weightage in JEE Mains 2025
Classification of Elements and Periodicity in Properties JEE Main Questions 2025 Chemical Bonding and Molecular Structure Weightage in JEE Mains 2025
Chemical Bonding and Molecular Structure JEE Main Questions 2025
States of Matter JEE Main Questions 2025
Chemical Kinetics Weightage in JEE Mains 2025 p & s- Block Element JEE Main Questions 2025
Equilibrium Weightage in JEE Mains 2025 p-Block Element Weightage in JEE Mains 2025
Hydrogen JEE Main Questions 2025
Hydrogen Weightage in JEE Mains 2025
Redox Reactions Weightage in JEE Mains 2025
Organic Chemistry Weightage in JEE Mains 2025
Equilibrium JEE Main Questions 2025 Organic Chemistry JEE Main Questions 2025
Hydrocarbons JEE Main Questions 2025 Hydrocarbons Weightage in JEE Mains 2025

We hope this article has been helpful for the candidates to be aware of the Structure of Atom Weightage in JEE Mains 2025. For more information related to the JEE Mains 2025 exam, stay tuned to CollegeDekho! Candidates can also fill our Common Application Form in case of any queries related to JEE Main 2025.

Are you feeling lost and unsure about what career path to take after completing 12th standard?

Say goodbye to confusion and hello to a bright future!

news_cta

FAQs

Is NCERT enough for the JEE Mains 2025 preparation?

NCERT books are very important to prepare for the JEE Main 2025 exam. The JEE Main exam follows the CBSE syllabus for 11th and 12th classes, so NCERT books are considered to be the most reliable and necessary study materials. NCERT books explain basic fundamental concepts in a simple and clear way.

 

Is atomic structure tough?

Atomic structure is an easy chapter with fairly simple concepts which candidates can grasp easily making it a student favourite.

Is it easy to score 99 percentile in the JEE Mains exam?

To score a 99+ percentile in the JEE Main 2025 exam, candidates require more than just knowing the JEE Main syllabus, as it required consistent practice, strategic revision, time management, and the ability to solve complex problems under pressure. However, with the appropriate resources, one can achieve these requirements.

What are the 3 rules of atomic structure?

The way electronic configurations are designated for cations and anions is essentially similar to that for neutral atoms in their ground state which implies the three important rules: Aufbau Principle, Pauli-exclusion Principle, and Hund's Rule.

Can I leave chemistry for the JEE Main exam?

All sections namely Mathematics, Physics, and Chemistry are mandatory in the JEE Main exam, with questions covering the entire JEE Main syllabus. To be eligible for admission, candidates must achieve the minimum qualifying marks in each subject and the overall aggregate.

 

Is PYQ enough for the JEE Mains 2025 exam?

PYQs are undeniably important in the JEE Main preparation process, but relying solely on them may not be sufficient for achieving success in the JEE Mains exam. A comprehensive approach which comprises a variety of study materials and strategies is necessary for qualifying the JEE Main exam.

 

Can I skip organic chemistry for the JEE Main exam?

Organic chemistry can be a challenging subject for many JEE aspirants because of its complex reaction mechanisms and various topics. However, it is an essential aspect of the JEE Mains syllabus, and with a clear strategy, candidates can tackle it effectively.

 

Will the JEE Mains syllabus change in 2025?

Candidates can study from the NCERT textbooks of class 11 and 12 Physics, Chemistry and Mathematics to cover the JEE Mains syllabus. No changes have been made to the JEE Main Syllabus 2025. NTA removed several topics of Physics, Chemistry and Mathematics last year from the JEE Main syllabus.

 

Is the structure of atoms section of Chemistry important for the JEE Mains exam?

The Atomic Structure chapter in the JEE Main exam is not only theoretical concepts; they are the key to unlocking one’s potential in the JEE Main exam. These topics hold substantial weightage in the JEE Main exam, and understanding them clearly can significantly boost one’s scores.

View More

JEE Main Previous Year Question Paper

2022 Physics Shift 1

2022 Physics Shift 2

2022 Chemistry Shift 1

2022 Chemistry Shift 2

2022 Mathematics Shift 1

2022 Mathematics Shift 2

2023 Chemistry Shift 1

2023 Mathematics Shift 1

2023 Physics Shift 2

2023 Mathematics Shift 2

2023 Chemistry Shift 2

2023 Physics Shift 1

2024 Chemistry Shift 1

2024 Mathematics Shift 2

2024 Physics Paper Morning Shift

2024 Mathematics Morning Shift

2024 Physics Shift 2

2024 Chemistry Shift 2

/articles/structure-of-atom-weightage-in-jee-mains/
View All Questions

Related Questions

In B tech which course is highly chance for getting job

-ayush kumar sahuUpdated on January 21, 2025 05:31 PM
  • 1 Answer
Rupsa, Content Team

Dear Student,

Bachelor of Technology or B.Tech is one of the most sought-after streams to pursue for a successful career. If you are planning to pursue a B.Tech course, you can aim for any of the available engineering courses as per your preferences. Every B.Tech branch offers you specialized studies in a particular field. For example, Computer Science engineering focuses on programming language, software development, and web development. Similarly, Civil Engineering focuses on the studies of construction, building materials, roads and highway construction etc.

Job opportunities after engineering can depend on your specialization and the demands of the job. …

READ MORE...

B. Tech entrance exam eligibility 2006,after diploma

-Shalini SUpdated on January 21, 2025 05:21 PM
  • 1 Answer
Rupsa, Content Team

Dear Student,

If you are planning to pursue a B.Tech course after completing your diploma in engineering, you can join a B.Tech 2nd-year course as a lateral entry student. However, you will be required to meet certain eligibility criteria for the same. The B.Tech entrance exam eligibility criteria after the Diploma may vary for different exams and conducting bodies. The general criteria require you to have completed a minimum of 3 years of diploma in engineering from an AICTE-approved institution with a minimum of 45% marks in diploma. Additionally, you should not have any backlogs left in your diploma …

READ MORE...

Bca fees and Where's the college and is there any scholarship or not?

-Kashish ChaudhariUpdated on January 21, 2025 06:01 PM
  • 1 Answer
Rupsa, Content Team

Dear Student,

The 1st year BCA fees at Dayanand College of Management Studies, Kanpur is INR 54,000 and the total fee is INR 1,54,000. BCA course admission is done directly at Dayanand College of Management Studies. The college is located at N Block, Govind Nagar, Kanpur, Uttar Pradesh 208006. There is no information regarding scholarship options at Dayanand College of Management Studies, Kanpur. However, according to the college alumni, the institute does not offer any scholarship options to students.

We hope this information was helpful to you. Good luck!

READ MORE...

Do you have a question? Ask us.

  • Typical response between 24-48 hours

  • Get personalized response

  • Free of Cost

  • Access to community

Recent Articles

Recent News

Subscribe to CollegeDekho News

By proceeding ahead you expressly agree to the CollegeDekho terms of use and privacy policy

Top 10 Engineering Colleges in India

View All
Top