periodic table

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Across
  1. 1. First goup
  2. 4. Group 17
  3. 5. Last group
  4. 6. Equals the number protons
  5. 7. Second Group
  6. 9. Group 16
  7. 10. Under the lanthanides and all of them are radioactive
  8. 11. Rows
Down
  1. 2. Groups 3 through 12
  2. 3. Columns
  3. 8. Part of period 6, under the periodic table