Across
- 2. which noble gas has the highest boiling point?
- 3. Group 0 are unreactive as they have a .... outer shell
- 4. How many electrons are on the outer shell of Krypton?
- 8. what is passed through neon gas to make a bright light?
- 9. Name the gas used in welding
Down
- 1. what is the name given to group 0, the ..... gases
- 5. what word describes them as being unreactive
- 6. Name the gas used in airships
- 7. what happens to the density of group 0 atoms down the group?