Periodic Table

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Across
  1. 4. these gases are unreactive
  2. 6. discovered a pattern to the elements
  3. 8. also known as semiconductors
  4. 10. positive charged particle
  5. 11. negative charged particle
  6. 12. a vertical column of elements
Down
  1. 1. most reactive nonmetals
  2. 2. on right side of periodic table
  3. 3. describes something that repeats at regular intervals
  4. 5. metals in group 1
  5. 7. these metals are in group 2
  6. 9. most elements are
  7. 10. a horizontal row