Periodic Table Crossword

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Across
  1. 2. all elements left of the staircase line
  2. 4. total of protons and neutrons in an atom
  3. 6. most reactive non-metal
  4. 8. metal most reactive family
  5. 10. diagram that relies solely on the number of valence electrons
  6. 14. subatomic particle with no charge
  7. 15. the number of protons in an atom
  8. 17. atoms will always react until they have a full shell
  9. 18. subatomic particle with a negative charge
  10. 20. subatomic particle with a positive charge
Down
  1. 1. elements touching the staircase line
  2. 3. section of the Periodic Table that splits into a separate area to fit on paper
  3. 5. an electrically charged element formed from electron movement
  4. 7. the table that arranges elements in a way that is easy to remember
  5. 9. the number of electrons on the outermost orbital of an atom
  6. 11. scientist who arranged the current periodic table
  7. 12. tells how many valence electrons an atom has
  8. 13. smallest unit of matter made of protons, neutrons, and electrons
  9. 16. gas non-reactive family
  10. 19. tells how many shells an atom has