The Periodic Table

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Across
  1. 7. most reactive family
  2. 8. most reactive non-metal
  3. 9. pure substance that can't be broken down into something simpler chemical means
  4. 11. electrons in the outermost shell
  5. 15. a measurement of gravity
  6. 17. all particles look the same
  7. 18. composed of 2 or more compounds physically combined
  8. 19. a substance made up of 2 or more element chemically combined
  9. 20. is the physical form in which a substance exists
Down
  1. 1. the number of protons in the element
  2. 2. this family doesn't react with any other elements
  3. 3. is the mass per unit volume of a substance
  4. 4. how much space something makes up
  5. 5. the basic unit of all matter
  6. 6. "the father of the Periodic Table"
  7. 10. relies solely on valence electrons
  8. 12. has a negative charge
  9. 13. has no charge
  10. 14. the particles look different
  11. 16. has a positive charge