Periodic Table crossword

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Across
  1. 2. Orbits the nucleus
  2. 4. found to the right of the stair step
  3. 5. Only nonmetal on the stair step
  4. 9. Compound its symbol is H2O
  5. 12. the organization of all elements
  6. 14. Multiple elements together
  7. 18. Symbol is Cl
  8. 19. Symbol is Na
  9. 20. weight of a element
Down
  1. 1. On the stair step of the table
  2. 3. On the bottom of the periodic table
  3. 6. Not fully metal
  4. 7. Positively charged particle
  5. 8. Builds up everything
  6. 10. the size of a element
  7. 11. Negatively charged particles
  8. 13. the basic form of everything
  9. 15. in the center of a atom
  10. 16. Symbol is Si
  11. 17. Multiple substances together can be separated