Unit 2

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Across
  1. 2. Radiation emits a high energy photon.
  2. 5. used the oil drop experiment.
  3. 8. proposed that atoms were indestructible and indivisible.
  4. 9. discovered electrons using a cathode ray tube.
  5. 11. is the number of protons in the nucleus of an atom.
  6. 12. Cloud only contains electrons.
  7. 15. emits helium nuclei.
Down
  1. 1. discovered the neutron.
  2. 3. is the total number of protons and neutrons in the nucleus of an atom.
  3. 4. are the smallest particles of an element.
  4. 6. are atoms that have the same number of protons but a different number of neutrons.
  5. 7. is weighted average mass of the atoms in a naturally occurring sample of an element.
  6. 10. discovered the nucleus of an atom.
  7. 13. contains protons and electrons.
  8. 14. used the scientific method to revise Democritus's model.