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Write D for DALTON, T for THOMSON, R for RUTHERFORD and B for BOHR.




______1. Proposed and conceptualized the atomic theory of matter.
______2. Atoms were not indivisible but were made up of smaller subatomic particles
______3. Also known as the Billiard Ball model of an atom.
______4. Designed an experiment using a thin gold foil and alpha particles.
______5. He discovered the electron because of his experiment.
______6. He believed that electrons in an atom exist in specific regions at various distances from the nucleus.
______7. He visualized the electrons as rotating in orbits around the nucleus, like planets rotating around the Sun.
______8. Also known as the Nuclear Model of an atom.
______9. He compared his model of an atom into a Raisin Bread or Plum Pudding.
______10. Electrons should be in one specific orbit or energy level.
______11. The center of an atom is positively charged because it repels the alpha particles, the charge of which is positive.
______12. Electrons move about the nucleus, not in a fixed location.
______13. Atoms were composed primarily of a very massive, positively charged blob or bread and negatively charged plums.
______14. Also known as the solid sphere model of an atom.
______15. Used the cathode ray for his experiment.