periodic table crossword

123456789101112131415161718192021
Across
  1. 2. what pennies are made out of
  2. 5. found in bananas
  3. 6. the basic building block of all matter
  4. 7. found on pages 90-91 in the resource book
  5. 13. a state of matter that has no definite volume or shape
  6. 14. its a very valuable metal
  7. 15. a particle comprised of two or more atoms
  8. 17. the only element named after our country
  9. 19. a state of matter that has a definite shape but no definite volume
  10. 21. makes balloons float and your voice high
Down
  1. 1. superman's home planet
  2. 3. symbol of Pu
  3. 4. two atoms of this element makes water
  4. 8. a charged atom
  5. 9. the number of protons in the nucleus
  6. 10. we normally stuff it in our pencils
  7. 11. a substance made entirely out of one type of atom
  8. 12. atomic number 12
  9. 16. an extreme necessity for breathing
  10. 18. found in milk
  11. 20. a source of light