Periodic table

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Across
  1. 2. Tells the scientist how many of each element(s) there are
  2. 3. A trait of an element that tells you which element, in the order of the periodic table, is present
  3. 5. The simplified version of any substance in scientific terms
  4. 7. A number before a chemical formula that tells you how many molecules there are
  5. 9. Two or more atoms chemically bonded
  6. 12. The weight of an element also listed on the periodic table
  7. 13. A pure substance that cannot be broken down or simplified
  8. 14. When not every part is equal or the same throughout the mixture
  9. 15. Two or more unalike atoms are mixed together and can-NOT be easily separated
  10. 17. When only the appearance of something changes
  11. 18. The result of an experiment
  12. 20. The creator of the periodic table
Down
  1. 1. When Two or more ALIKE atoms are combined together
  2. 4. A substance that enters into and is altered in the course of a chemical reaction
  3. 6. When a substance changes from one thing into another
  4. 8. What makes up EVERYTHING
  5. 10. Has one or two letters that helps scientists identify which element is present
  6. 11. The person performing an experiment or leading a study
  7. 16. When every atom is mixed evenly throughout
  8. 19. An organizer of elements