Crossword Puzzle on Halogens

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Across
  1. 4. Greenish gas.
  2. 5. Known as the Father of Modern Chemistry.
  3. 7. Black solid.
  4. 8. Black solid, when heated becomes a purple vapor.
Down
  1. 1. Pale yellow gas.
  2. 2. Synthetic chemical element.
  3. 3. Dark red liquid.
  4. 6. Extremely toxic nonmetals.