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Across
  1. 2. - Column in the periodic table.
  2. 4. - Inert gases group.
  3. 6. - Reactive nonmetals group.
  4. 7. - Related to the periodic table.
Down
  1. 1. - Middle block of elements.
  2. 3. - Earth metal family.
  3. 5. - Row in the periodic table.