The Atomic Theory

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Across
  1. 2. Discovered alpha particles, determined that the nucleus was a dense center of positive charge.
  2. 6. Discovered atoms had positive and negative charges
  3. 7. Figured out electrons behave like waves
  4. 8. Developed first atomic theory of matter
Down
  1. 1. Determined that electrons are in circular paths depending ion their energy level
  2. 3. Found neutrons
  3. 4. Discovered elements are made up of extremely small particles called atoms
  4. 5. Discovered atoms contain negative particles called electrons
  5. 6. Helped arrange atoms in the periodic table
  6. 7. Bohr model