Atomic Theory

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Across
  1. 1. this number is the same as the number of protons
  2. 4. number of protons in magnesium
  3. 5. scientist who conducted the Gold Foil Experiment
  4. 8. electrons on the outermost shell
  5. 9. subatomic particle responsible for mass number
  6. 10. number of _______ is equal to the number of protons in a neutral atom
  7. 11. a positively charged subatomic particle
Down
  1. 2. versions of an element with different number of neutrons
  2. 3. model that included energy levels but was only accurate for elements like hydrogen
  3. 4. scientist who discovered the electron
  4. 6. model that includes orbitals
  5. 7. model developed by JJ Thomson that shows protons in a sea of electrons