Periodic table crossword

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Across
  1. 2. Gold is this type of element
  2. 4. Germanium is this type of metal
  3. 5. Krypton is this kind of element
  4. 7. published the 2nd periodic table in 1870
  5. 9. Brittle bad conductors of heat and electricity
  6. 11. in air
  7. 12. can be classified as a nonmetal and a metal
Down
  1. 1. Made the first periodic table
  2. 3. not found alone in nature has a charge of +2 and oxidi
  3. 6. This periodic table group is nonreactive
  4. 8. This metal is the most reactive metal
  5. 9. Designed first periodic table but incomplete
  6. 10. Good conductor of electricity and heat also dense