periodic table

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Across
  1. 2. the most electrically conductive metal on earth
  2. 3. A Halogen which kills germs?
  3. 7. sixth most abundant metal in the earth's crust
  4. 8. element has a atomic number of 9
  5. 9. Alkali Metals, Halogens, Noble Gases, etc.
Down
  1. 1. the lightest element in the periodic table.
  2. 4. fluorine, chlorine, bromine,iodine, and astatine. Group 17
  3. 5. Protons+?=Atomic Mass
  4. 6. Gas A gaseous element that is not reactive