Atomic Structure

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Across
  1. 1. path an electron travels around the nucleus
  2. 3. small, dense, central part of an atom
  3. 5. discovered the neutron
  4. 9. has mass and volume
  5. 10. discovered charge and mass of an electron
  6. 12. the "DNA" of an atom
  7. 14. discovered the nucleus of an atom
  8. 15. same atomic number but different neutrons
  9. 17. sum of protons and neutrons
  10. 19. said all matter was made of atoms that were indivisible and could form compounds
  11. 21. discovered the electron from cathode rays
Down
  1. 2. an atom that has gained or lost an electron
  2. 4. negative particle found outside the nucleus
  3. 6. tells the number of protons in an atom
  4. 7. due to a loss or gain of electrons
  5. 8. "atomos"
  6. 11. weighted average of all an atom's isotopes' masses
  7. 13. particle responsible for isotopes
  8. 16. atomic model with electrons embedded in a positive atom
  9. 18. basic unit of an element
  10. 20. described the atom like a solar system