The Periodic Table

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Across
  1. 2. Starts below Boron
  2. 4. H2O
  3. 6. Along the stair-step line
  4. 7. positive charge
  5. 9. group 17
  6. 11. element symbol is C
  7. 13. NaCl
  8. 15. the number of protons an atom has
  9. 16. element symbol is K
  10. 17. Left of stair-step line
  11. 19. The columns on the Periodic table
  12. 20. CO2
Down
  1. 1. the rows on the Periodic table
  2. 3. Negatively charged
  3. 5. electrically neutral
  4. 8. Right of stair-step line
  5. 10. protons + neutrons
  6. 12. proton numbers always stay the same
  7. 14. element symbol is Na
  8. 18. the positively charged center of the atom