Periodic Table Crossword Puzzle

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Across
  1. 2. mistaken for pencil
  2. 4. horizontal rows
  3. 7. 2nd most abundant and 14 neutrons
  4. 10. first element in 4th period
  5. 12. nitrogen family with 16 neutrons
  6. 13. member of boron family most abundant
  7. 14. noble gas with 2 electrons
  8. 15. member of the halogen family with atomic number of 53
  9. 16. 26 protons
  10. 19. transition metal with 25 electrons
  11. 21. gas with mass number of 19
  12. 25. found in teeth
  13. 26. only element the in the halogen family that is a liquid
  14. 29. have 2 electrons in first shell
  15. 30. gas with 8 protons
  16. 31. metal with 28 electrons
  17. 35. transition metal with 30 e
  18. 36. make up 79% of air
  19. 38. nonmetyals tend to form ions with a charge
  20. 39. most elements
Down
  1. 1. most active nonmetals
  2. 3. metals tend to form ions
  3. 5. type of gas considered inactive
  4. 6. in carbon family in 5th period
  5. 8. elements are arranged by atomic
  6. 9. atomic mass 35.453
  7. 11. member of the alkaline earth metals used to make fireworks
  8. 17. atomic number is 47
  9. 18. metal that's liquid
  10. 20. vertical columns or families
  11. 22. name for group 1
  12. 23. not really a alkali metal
  13. 24. metals in the middle of the periodic tbale
  14. 27. number of protons and neutrons
  15. 28. name for group II
  16. 32. head of the carbon family
  17. 33. atomic number is the number of
  18. 34. silvery white metal used to make salt
  19. 37. atomic number is 79