Across
- 2. Renowned chemist who developed the periodic table (9)
- 5. Nobel Prize-winning chemist known for electron theory (5)
- 6. A highly reactive metal in group 1 (7)
- 8. This gas supports combustion (6)
Down
- 1. Gas used in party balloons (6)
- 3. Element named after Marie Curie (6)
- 4. Lightest element in the periodic table (8)
- 7. Type of bond in sodium chloride (5)