The Periodic Table

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Across
  1. 2. I'm found in salt and I belong to the Halogens.
  2. 5. We are solid at room temperature.
  3. 8. I made the periodic table.
  4. 9. We are the elements in group 13 and boron is found in this group.
  5. 10. We are unreactive nonmetals.
  6. 11. I am the number of protons and neutrons in the nucleus of an atom.
  7. 13. I am also called a semiconductor.
  8. 14. I am necessary for you to breath.
  9. 15. We are the 1st group in the periodic table and we are reactive metals.
  10. 17. I'm not ductile are malleable.
Down
  1. 1. I am the abbreviation of an element.
  2. 3. I am the only element in my family.
  3. 4. We are the elements in groups 3-12.
  4. 6. I state that the repeating chemical and physical properties of elements change periodically with the elements’ atomic numbers.
  5. 7. I am found in neon signs.
  6. 12. Some of the elements in my group are chlorine and fluorine.
  7. 13. I am shiny and a great conductor.
  8. 15. We are radioactive, or unstable
  9. 16. My chemical symbol is He.
  10. 18. I make up about 80% of the air in our atmosphere.