Across
- 3. Metal with variable valency 1 and 2
- 6. Noble gas with a duplet
- 8. A neutral gas
- 9. Supporter of combustion
- 10. Gives a brick red flame
Down
- 1. Radioactive elements
- 2. A highly reactive metal
- 3. A monovalent nonmetal
- 4. Valency of Group 18 elements
- 5. A metalloid in Period 3
- 7. Electrons in the outermost orbit