The periodic table word search

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Across
  1. 2. The rows in the periodic table were called.
  2. 4. Describes how likely an element is to form bonds with other elements.
  3. 5. This is the heaviest metal.
  4. 8. These make up elements.
  5. 9. The first element founded was.
  6. 11. This is the lightest metal.
  7. 13. I would make a joke but the best ones ______.
  8. 14. A pure substance consisting of only atoms.
  9. 15. Vertical column of elements.
  10. 16. This gas is used in light up signs.
  11. 18. We breath it in.
Down
  1. 1. This element is used for balloons.
  2. 3. Most elements on the table are.
  3. 6. An element that has gained or lost one or more electrons.
  4. 7. Weight The periodic table is in order by.
  5. 8. This is the rarest metal.
  6. 9. If you don't get enough you get cramps.
  7. 10. This type of metal has a low melting point.
  8. 12. He created the modern periodic table.
  9. 17. We mine this metal.