Unit 3 Crossword

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Across
  1. 1. an atom with a different number of neutrons/different mass
  2. 5. drew models to predict element reactivity
  3. 7. believed the atom had a dense, positive center (gold foil experiment)
  4. 9. believed all atoms of an element were exactly alike
  5. 10. when an atom has an equal amount of protons and electrons
  6. 12. a positively charged ion, occurs when electrons are lost
  7. 14. a charged atom that has lost or gained electrons
  8. 15. discovered the mass and charge of the electron (oil drop experiment)
  9. 16. the number below an element on the periodic table, represents the protons plus neutrons
Down
  1. 2. imagined the atom as a positive sphere mixed with negative electrons
  2. 3. subatomic particle with no charge
  3. 4. these electrons belong in the outer most energy level of a Bohr model
  4. 6. positively charged subatomic particle
  5. 8. negatively charged subatomic particle
  6. 9. named the atom "atomos", meaning indivisible
  7. 11. the number above an element on the periodic table, represents the protons
  8. 13. a negatively charged ion, occurs when electrons are gained