Science

Discovery of subatomic particles

उपपरमाण्विक कणों की खोज

In Class 9 Science, this topic from “Journey Inside the Atom” explains how scientists discovered that atoms are not indivisible. Students learn how cathode-ray and canal-ray experiments provided evidence for negatively charged electrons and positively charged particles, and how later work led to the identification of protons and neutrons. The topic connects these discoveries with electric charge, relative mass, and the basic structure of an atom, helping learners understand why atomic models changed over time.