Periodic table

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Across
  1. 3. name of group 1
  2. 5. on the left of staircase
  3. 6. this is what we call rows on the periodic table
  4. 7. on the right of staircase
Down
  1. 1. name of group 17
  2. 2. name of staircase
  3. 4. name of group 18