Structure of Atom Weightage in JEE Mains 2025
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: 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.
- Dalton's Atomic Theory - It states that atoms are indivisible and indestructible.
- Thomson's Model (Plum Pudding Model) - It describes an atom as a sphere of positive charge with electrons embedded in it.
- Rutherford’s Nuclear Model - It states that an atom has a dense, positively charged nucleus surrounded by electrons in empty space.
- Bohr’s Model - It states that electrons revolve in specific orbits with quantized energy.
- Quantum Mechanical Model - It describes electrons as wave functions with probabilistic distributions around the nucleus.
- Quantum Mechanics - They comprise;
- Dual Nature of Matter and Radiation - It states that particles such as electrons exhibit both wave and particle properties.
- Heisenberg’s Uncertainty Principle: It states that it is impossible to simultaneously measure the position and momentum of a particle with absolute accuracy.
- 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;
- 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.
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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 tableChapter | 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 Physics Questions in June Session | JEE Main Physics 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.
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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.