Choice Board Crossword

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Across
  1. 3. strong metal
  2. 4. atomic number 3
  3. 7. mineral in milk that's good for bones
  4. 9. pennies are made of
  5. 12. gold and _ are considered valuable
  6. 13. atomic number 86, noble gas, radioactive
  7. 16. a shiny silver metal that's also a coin
  8. 17. atomic number 82 and symbol Pb
  9. 18. symbol Ru
  10. 20. atomic number 7
Down
  1. 1. balloons are filled with...
  2. 2. salt is chloride and...
  3. 5. atomic number 43 on the periodic table
  4. 6. water is oxygen and...
  5. 8. closest planet to the sun
  6. 10. symbol B
  7. 11. brittle alkaline earth metal, number 4
  8. 14. the air that we need is...
  9. 15. atomic number 9, used in toothpaste
  10. 19. super brights colors are considered...