Atomic theory

• gave the name atom or atomos

  democritus
• discovered the theory of atomsism

  leucippus
• they are invisible

  atoms
• it is the earth, wind, fire, and water

  aristotle
• he said " atoms, are tiny, hard spheres that cannot split up

  Jhon Dalton
• J.J Thompson discovered the electron in 1897 using cathode ray
• discovered protons, gold foil experiment

  Ernest Rutherford
• discovered neutrons

  James Chadrick