Chemistry year 8

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Across
  1. 4. two or more different elements chemically joined
  2. 5. joins elements together
  3. 6. how the "a" in the symbol for sodium should be
  4. 7. where non metals are found in the periodic table
  5. 13. contains genetic information.
  6. 14. when there are different elements and/or compounds not chemically combined
  7. 16. what the "2" in H20 should be shown in
  8. 18. a common acid
  9. 21. the most abundant gas in the air
  10. 23. found on the periodic table
Down
  1. 1. combines with iron to make rust
  2. 2. the number of atoms in a hydrogen molecule
  3. 3. found in group 0
  4. 4. a method of burning wax to create light
  5. 8. the smallest atom
  6. 9. has two hydrogens and an oxygen
  7. 10. an element that is liquid at room temperature
  8. 11. the number of atoms in methane
  9. 12. nitrogen,oxygen and hydrogen like to be in a...
  10. 15. has an atomic number of 86
  11. 17. number of atoms in a sulphur dioxide molecule
  12. 19. found on the left hand side of the periodic table
  13. 20. ______ elements are either solids or gases.
  14. 22. how many oxygen atoms in a molecule of carbon dioxide