Iodine

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Across
  1. 2. Swims in the sea
  2. 3. One hundred and twenty seven
  3. 5. Sodium at the table
  4. 7. Group 17 of the periodic table
  5. 8. Form at room temperature
  6. 9. Colour of gas
Down
  1. 1. Atomic number
  2. 4. Salty sea snack
  3. 5. Take daily for good health
  4. 6. Neck gland