Atomic Theory

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Across
  1. 2. the scientist who invented the "Billiard Ball Mode"
  2. 4. same element, different mass
  3. 6. an atom with lost or gained electrons
  4. 9. chemist that discovered the orbital model
  5. 13. The scientist that discredited Leucippus and Democritus
  6. 14. Subatomic particle with a negative charge
  7. 15. drop experiment to find charge and mass of the electron
  8. 17. rejected the idea of only four elements
  9. 18. the sum of protons and neutrons on the periodic table
  10. 19. substance that cannot be broken down into a smaller substance
Down
  1. 1. means atom in greek
  2. 3. subatomic particle with a positive charge
  3. 5. a chemical bond of two elements
  4. 7. a mathematical expression to find the wave function
  5. 8. electrons at the out edge of the shell
  6. 10. Subatomic particle with a neutral charge
  7. 11. who discovered the electron
  8. 12. type of model that includes element symbol as the nucleus
  9. 16. atom or molecule that gained or lost an electron