cross word puzzles

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Across
  1. 2. Fr
  2. 3. Zn
  3. 6. Yb
  4. 8. B
  5. 10. is stuff everything is made of
  6. 11. yellow metal found in the ground
  7. 12. the amount of space the object is in
  8. 13. an important property
  9. 15. is the amount of matter
  10. 16. N
  11. 17. Nb
  12. 18. the space an object occupies
  13. 20. F
  14. 21. manly nitrogen and oxygen
Down
  1. 1. Ir
  2. 4. Pa
  3. 5. Ag
  4. 7. include such things as steel things
  5. 9. O
  6. 10. gas that smells bad
  7. 11. Ge
  8. 14. Ti
  9. 19. the volume of a container