The Periodic Table

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Across
  1. 5. I am the heaviest metal in the 4th period
  2. 6. the metalloid with 3 shells
  3. 9. the alkaline _____ metals are in group 2A
  4. 10. the group with a full outer shell of electrons
  5. 13. I am in Group 1A but am not a metal
  6. 14. the group 1A metals
  7. 15. these elements are good conductors of electricity
  8. 17. my atomic number is 16
  9. 18. the alkali earth metal in period 3
  10. 21. the type of ions formed by metals
Down
  1. 1. a gas with a mass of 19
  2. 2. I am in the 4th energy level and have 7 valence electrons
  3. 3. If I lose 2 protons I will become nickel
  4. 4. this tells you how many energy levels (shells) an atom has
  5. 7. this tells you the number of valence electrons in an atom
  6. 8. Group 7A
  7. 11. the type of ions formed by nonmetals
  8. 12. I have 19 protons
  9. 13. I am the lightest noble gas
  10. 16. elements with some properties of metals and some of nonmetals
  11. 19. elements on the right side of the periodic table
  12. 20. the noble gas in the second period