PERIODIC TABLE

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Across
  1. 3. What element has the atomic mass of 1.008?
  2. 7. AU is what for Gold?
  3. 10. What is hydrogen?
  4. 11. What are the horizontal lines called?
  5. 15. All elements have protons neutrons and what?
  6. 17. What is column 2?
  7. 18. What is column 18?
  8. 19. How many protons does boron have?
Down
  1. 1. What is column 17?
  2. 2. Who created the Periodic Table?
  3. 4. What kind of element is Helium?
  4. 5. Weighted average of mass of an element?
  5. 6. What is column 1?
  6. 8. What element has the symbol S?
  7. 9. What is another word for columns?
  8. 12. What is another name for rows?
  9. 13. What are the vertical lines called?
  10. 14. Columns 3-12 are what kinda of metals?
  11. 15. What is oxygen?
  12. 16. The amount of protons is equal to the what?