Chemistry

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Across
  1. 2. type of electron on the outside of an atom
  2. 7. type of gas that is unreactive
  3. 8. where the protons and neutrons are found in the atom
  4. 10. the number of electrons in the 2nd energy level
  5. 14. element that has properties of metals and nonmetals
  6. 15. 18 of them on the periodic table
  7. 17. most common type of element
  8. 20. "rings" around the nucleus that contain electrons
  9. 21. element has 8 valence electrons
Down
  1. 1. element that has 2 valence electrons
  2. 3. elements found in the upper right of the periodic table
  3. 4. 7 of them on the periodic table
  4. 5. example of a noble gas
  5. 6. type of "number" that give the number of protons
  6. 9. example of alkaline metal
  7. 11. example of transition metal
  8. 12. example of alkali metal
  9. 13. diagram to show where electrons can be found
  10. 16. Demetri Mendeleev is considered the _____ of the periodic table
  11. 18. element that has 6 valence electrons
  12. 19. example of a halogen group