periodic table trends!

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Across
  1. 3. which one has the lowest ionization energy.francium or helium?
  2. 4. what is the atomic number of fluorine?
  3. 6. a gas that is commonly used
  4. 8. the only metaloid in group 13
  5. 12. the periodic table mostly consists of this type of element
  6. 13. a metal in group 8 of the periodic table
  7. 14. what side are the metals usually on?
Down
  1. 1. the elements in each___ have the same number of valence electrons
  2. 2. the least reactive metal
  3. 3. the most reactive element of group 1
  4. 5. what are the horizontal rows in the periodic table called?
  5. 7. the number of protons in the nucleus of an atom is called a__
  6. 9. its in the air we breathe (not oxygen)
  7. 10. what is the most important element on the table?
  8. 11. group 18 consists of this type of element