Physics

Atomic Masses and Composition of Nucleus

परमाणु द्रव्यमान और नाभिक का संघटन

In this Class 12 Physics topic from Chapter 13: Nuclei, students learn how atomic masses are expressed using the unified atomic mass unit and how mass number identifies the total number of nucleons in a nucleus. The topic explains the composition of nuclei in terms of protons and neutrons, links atomic number and isotopes to nuclear identity, and develops the notation used to describe nuclides. It provides a foundation for understanding nuclear size, stability, and later ideas such as mass defect and binding energy.