Periodic Table Crossword

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Across
  1. 2. Number / number of protons
  2. 8. / Group 2A metals
  3. 10. / Atomic Number = 5
  4. 12. / Si
  5. 13. / E.C.: 1s^2 2s^2 2p^6 3s^2
  6. 17. / What we breathe in
  7. 18. / use roman numerals to label
  8. 20. / created when electrons gained, nonmetals negative
  9. 24. / Group 7A nonmetals
  10. 26. 78% of Earth's atmosphere
  11. 28. / Alkali metal in Period 2
  12. 30. / Volcanic erupts-dries yellow powder
Down
  1. 1. / created when electrons lost, metals positive
  2. 3. / Common Soluble "Salt"
  3. 4. / supports bone structure, found in milk
  4. 5. / used in toothpaste and refrigerator Freon
  5. 6. / what diamonds are composed of
  6. 7. / in pool water
  7. 9. / light bulbs; atomic number=18
  8. 11. / comes from Greek word "BERYL"
  9. 14. / Different proton numbers
  10. 15. / periodic table based on atomic mass instead of atomic number
  11. 16. / Covers match heads
  12. 19. Number / sum of protons and neutrons
  13. 21. / ___ chloride is common table salt
  14. 22. / most abundant elements
  15. 23. / Foil made of it
  16. 25. / glow lamps, signs, television tubes
  17. 27. / Group 1A metals
  18. 29. / add "lift" to balloons