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