Periodic Table Crossword puzzle.

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Across
  1. 1. this is a type of substance.
  2. 3. a horizontal row on the periodic table.
  3. 8. anything with mass or volume.
  4. 10. the smallest unit of the element.
  5. 12. boron falls under this category.
  6. 15. an atom that has lost or gained, one or more electrons.
  7. 16. you put this element in balloons.
  8. 18. a substance that can not be broken down into simpler substances.
  9. 19. this element falls under transition metals.
  10. 20. a column (up or down) on the periodic table.
Down
  1. 2. the smallest unit of the compound.
  2. 4. describes how likely an element is to form bonds with other elements.
  3. 5. a stable particle with positive charge.
  4. 6. this element is found as a setting on jewelry.
  5. 7. this element is found in milk, and in our bones.
  6. 9. this element is found in the pools we swim in.
  7. 11. we breathe this element and it's nonmetal.
  8. 13. elements and/or compounds that when put together are unable to react chemically.
  9. 14. this element is very strong.
  10. 17. an element or substance that conducts heat and electricity.