Atoms and Nuclei Weightage in JEE Mains 2025

Atoms & Nuclei

6.50%

2

8

• Alpha particle scattering experiment
• Rutherford model of atoms/Bohr model
• Energy levels
• Hydrogen spectrum
• Size & composition of the nucleus
• Atomic masses/isotopes/isobars/isotones
• Radioactivity
• Alpha, beta, gamma rays and particles & their properties
• Radioactive decay law
• Relation of mass and energy
• Mass defect
• Binding energy per nucleon (its variation with mass number)
• Nuclear fusion and fission

Day

Topics

Tasks

• Alpha particle scattering experiment
• Rutherford model of atoms/Bohr model
• Energy levels
• Hydrogen spectrum

Read all the major concepts of these topics, and practice numerical if any.

Day 2

• Size & composition of the nucleus
• Atomic masses/isotopes/isobars/isotones
• Radioactivity
• Alpha, beta, gamma rays and particles & their properties

Revise the previous topics and prepare these. Radioactivity is a simple concept; applicants can cover it quickly.

Day 3

• Radioactive decay law
• Relation of mass and energy
• Mass defect
• Binding energy per nucleon (its variation with mass number)
• Nuclear fusion and fission

Cover the remaining radioactive concepts and then move on to mass-energy relations and nuclear fusion and fission. These are important topics in this chapter.

Day 4

Practice last year's important questions from this chapter

Look for the sample questions and PYQs for the atoms & Nuclei chapter with solutions. Track the performance by practising this paper.