Classification of matter

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Across
  1. 3. the horizontal rows of the periodic table
  2. 4. these are also known as semi-metals.
  3. 5. an abbreviation for the element.
  4. 8. He
  5. 9. Si
  6. 10. number of protons + neutrons
  7. 13. the elements in group _____ cannot react with other elements.
  8. 14. F
  9. 15. O
  10. 16. Zn
  11. 19. subtract atomic number from the atomic mass.
  12. 20. Mn
  13. 24. number of protons and electrons in an atom of an element.
  14. 28. H
  15. 29. Fe
  16. 30. Al
  17. 31. Cl
  18. 33. Ne
Down
  1. 1. P
  2. 2. K
  3. 6. elements in the same proud have similar _____.
  4. 7. N
  5. 11. Na
  6. 12. Mg
  7. 17. C
  8. 18. C
  9. 21. Cu
  10. 22. vertical columns of the periodic table
  11. 23. Li
  12. 25. Be
  13. 26. S
  14. 27. B
  15. 32. Ar