Chemistry Vocabulary

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Across
  1. 4. an arrangement of elements into rows and columbs
  2. 6. the space occupied by a sample of matter
  3. 9. a starting substance in a chemical reaction
  4. 10. A substance that can not be changed into something simpler
  5. 12. a negatively charged subatomic particle
  6. 13. negative and a negative or positive and a positive charge
  7. 15. A mixture that is completely uniform in its composition
  8. 16. a homogeneous mixture
  9. 18. the smallest particle of an element
  10. 19. The ratio of the mass of an object to it volume
  11. 20. figures all the digits that can be known precisely in a measurement
Down
  1. 1. a mixture that is not uniform in composition
  2. 2. a chemical equation in which mass is converted
  3. 3. matter that has a definite shape and volume
  4. 5. positive and negative charges
  5. 7. anything that takes up space and has mass
  6. 8. A reaction that has to do with fire
  7. 11. a pair of valence electrons that is not involved in bonding
  8. 14. atoms of the same element that have the same atomic number
  9. 17. the amount of matter in an object