| Answer | Crossword Clue |
|---|---|
| INERT | Like the noble gases |
| STABLE | Like noble gases |
| INERT | Like noble gases |
| RADON | Heaviest of the noble gases |
| NEON | One of the noble gases |
| ARGON | One of the noble gases |
| RADON | One of the noble gases |
| XENON | One of the noble gases |
| ARGON | Most common of the noble gases |
