Matter project

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Across
  1. 2. 46% of the Earth's weight is the answer
  2. 5. a hard object
  3. 6. it is the smallest unit of mater
  4. 7. the particles never stop moving
  5. 9. oxygen is usually the molecule
  6. 13. change when two chemicals react to others
  7. 14. it floats on water
  8. 15. the atomic number is 6
Down
  1. 1. the atomic number is 5
  2. 3. it is the least dense
  3. 4. it only has 1 atom
  4. 8. it is when a gas becomes a liquid
  5. 10. it is the most stable element
  6. 11. can take up any container
  7. 12. change when the size or shape changes
  8. 13. reaction involves breaking chemical bounds.