Atomic Structure

• Atoms are not indivisible and are composed of three fundamental particles. These particles are electrons, protons, and neutrons.

• Charged particles in Matter
  • Electrons are negatively-charged particles. They were discovered by J. J. Thomson, by cathode ray experiment. 
  • Canal rays are positively charged radiation consisting of protons. Protons are positively-charged particles and were discovered by E. Goldstein. 
  • The third fundamental particles present in an atom are neutrons. They are electr…