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NCERT Books for Class 12 Physics Chapter 13 - Nuclei Free PDF Download

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NCERT Class 12 Physics Chapter 13 Nuclei

Students can find about the topics from the Physics syllabus for class 12 that is available in Vedantu. Students can also find various other study materials of class 12, like solutions, previous years’ question papers, sample papers in Vedantu. Another way to avail the free resources at Vedantu is to simply download the Vedantu app .


Free NCERT Books download for Class 12 Physics Chapter 13 - Nuclei on Vedantu.com. Students can also download the NCERT Textbooks Solutions in PDF for Class 6 to 12 all subjects. Register for Physics tuition to clear your doubts and score more in your exams.

Nuclei are found in the center of an atom. A nucleus is made up of positively charged protons and neutrally charged neutrons. 


Chapter 13 of class 12 Physics is an important chapter in the NCERT books which goes deep into the structure of the nucleus. Some of the important topics of Nuclei are mass energy and nuclear binding energy, radioactivity, nuclear force and nuclear energy.

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What are Protons and Neutrons?

Particles that make up a nucleus of an atom have positive charges equal but opposite. Proton has a charge equal to +1, whereas the neutron has no charge. These charges are equal and opposite because the number of protons and neutrons in a nucleus must be balanced.


The size of the nuclei is very small in relation to the size of atoms or molecules. The diameter of a nucleus can be around 10 meters, i.e. 10,000 times smaller than a molecule or an atom.


How many Nuclei are there in an atom?

There is only one nucleus in the center (core) of an atom. An atom consists of electrons that orbit around it to make a complete volume. The proton and the neutron particles are present within the nucleus at all times, and they do not move. They are held together centrally by a very strong force called the strong nuclear interaction.

FAQs on NCERT Books for Class 12 Physics Chapter 13 - Nuclei Free PDF Download

1. What are nuclear forces?

Nuclear forces are the forces that act between nucleons (protons and neutrons) in the nucleus of an atom. These forces are relatively weak compared to other fundamental forces acting between individual atoms. Because, nucleons have a large mass. These forces play a vital role in determining the properties of all nuclei. The properties of these interactions are governed by different parameters such as masses and charges of individual particles.  

2. What is the difference between a strong nuclear force and a weak nuclear force?

Strong nuclear force and a weak nuclear force can be differentiated as follows:

  • Strong nuclear force acts between nucleons (protons and neutrons) within the nucleus only, while the weak nuclear force also acts on protons and neutrons but it can act at a distance of up to 1 meter. 

  • Strong and weak nuclear forces govern the structure of the nucleus. 

  • Strong nuclear force holds the protons and neutrons together within a nucleus, while the weak nuclear force is responsible for a number of phenomena such as beta decay, which occurs when a neutron decays into a proton, electron, and antineutrino.

3. What is a normal nuclear force?

The interaction is called the strong nuclear force, which is a fundamental force that acts between particles inside the nucleus of an atom. This is also sometimes called the 'color force' or simply 'strong'. In quantum chromodynamics (QCD), a theory of quarks and gluons, interactions similar to those involving the strong nuclear force (such as gluon-gluon and quark-quark interactions) are mediated by particles called gluons. Students can download the PDF file of the NCERT Solutions for CBSE Board Exams from Vedantu to learn more about the nuclear forces.