Periodic Table

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Across
  1. 1. The stairs of the periodic table
  2. 3. The 1st group
  3. 4. The rows of the periodic table
  4. 6. H
  5. 7. The 8th group
  6. 9. O
Down
  1. 2. The largest element group
  2. 5. The 7th group
  3. 6. Compound for water
  4. 8. The columns of the periodic table