Atomic Theory and the Periodic Table

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Across
  1. 2. mass the sum of the protons and the neutrons in an atom (2 words)
  2. 4. discovered the neutron
  3. 6. designed the first Periodic Table (look in your journey notes)
  4. 8. on the Periodic Table, these are also called Families or Groups.
  5. 9. levels where the electrons are found in an atom
  6. 13. discovered the nucleus
  7. 17. Metals Lithium;s (Li) family on the Periodic Table
  8. 18. where the protons and neutrons are found in an atom
  9. 19. positively charged particle
  10. 20. the smallest of the three subatomic particles that we learned about
Down
  1. 1. the electrons in the outermost energy level are called _____ electrons.
  2. 3. discovered the electron
  3. 5. thought that all matter was made out of atoms, he didn't have any evidence to back up his ideas.
  4. 6. Your favorite science teacher
  5. 7. Model a way to draw atoms that shows the electrons in the energy levels (2 words)
  6. 10. the number of electrons the 2nd energy level can hold
  7. 11. Rutherford used foil made out of this element
  8. 12. thought that all matter was made out of a combination of air, fire, water and earth.
  9. 14. Fluorine's (F) family on the Periodic Table
  10. 15. discovered the proton
  11. 16. particle with no charge
  12. 21. on the Periodic Tables, these are also called Periods