Science Cartoon

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  • Oh Man! I'm going to fail this test on Monday.
  • Atomic Theories Test on Monday!
  • Just remember that there are four main theories and there are four main scientists behind them.
  • The first major theory was the Billiard Ball Theory and it was proposed by John Dalton in the early 1800's.
  • Well John Dalton thought that atoms couldn't be created or destroyed. He saw them as the smallest particles of matter. Like a pool ball or billiard ball, he thought of them as a solid sphere.
  • The Billiard Ball Theory
  • The second theory was proved by J.J Thomson when he used a cathode ray and charged plates to prove the existence of subatomic particles
  • The experiment proved the existence of subatomic particles. In this raisin bun, the raisins would be the electrons and protons while the entire bun was thought of as a neutral atom.
  • The Plum Pudding Model
  • This theory was discovered by Ernest Rutherford when he fired alpha particles at a thin gold foil and some of the particles repelled in different directiond while others went straight through.
  • From his experiment, he discovered that there is a dense positive mass at the centre of the atom and their is empty space around the nucleus where the electrons circle like planets.
  • The Solar System Model
  • Neils Bohr discovered that since atoms are usually stable, electrons must move between allowable energy levels when energy is added or lost.
  • He also discovered that each energy level could only hold a specific number of electrons.
  • The Electron Energy Model
  • Wow! I think I was more prepared than I thought I was.
  • Thats good! However don't forget that today we use the quantum mechanical model but you don't need to worry about that right now!
  • Atomic Theories Test on Monday!
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