ELEMENT

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Across
  1. 4. protect simple goiter
  2. 5. gas in balloon
  3. 7. full valence electron as 8
  4. 9. diagonal of block-p in Periodic table
Down
  1. 1. liquid in VIIA
  2. 2. valence electron as 2
  3. 3. Atomic number is 11
  4. 5. poisonous element
  5. 6. Electrical conductivity
  6. 8. knife can cut