Periodic Table

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Across
  1. 3. positive charge, inside the nucleus
  2. 6. model showing the number of electrons with dots
  3. 7. no charge, inside the nucleus
  4. 9. a charged element
  5. 10. creator of the current periodic table
  6. 13. an ion with more protons than electrons
  7. 14. most reactive non-metal family
  8. 16. 2 or more compounds physically combined
  9. 18. most reactive family
  10. 19. pure substance that can't be broken down
  11. 20. how many protons an element has
Down
  1. 1. total mass of an atom
  2. 2. a table made up of every element
  3. 4. electrons on the outer shell
  4. 5. model of an atom or elements
  5. 8. non-reactive, reacts with no other family
  6. 11. negative charge, outside the nucleus
  7. 12. an ion with more neutrons than protons
  8. 15. basic unit of matter
  9. 17. 2 or more chemically combined elements