| Answer | Crossword Clue |
|---|---|
| INERT | Like neon or krypton |
| GAS | Krypton or neon |
| INERT | Like krypton or xenon |
| NOBLE | Like argon or krypton |
| INERT | Like argon or krypton |
| INERT | Like neon or helium |
| INERT | Like helium or neon |
| INERT | Like xenon or neon |
| INERT | Like argon or neon |
| INERT | Like neon or xenon |
| INERT | Like neon or argon |
| INERT | Like argon or neon. |
| GASEOUS | Like neon or nitrogen |
| INERT | Like neon or radon |
| INERT | Like Freon or neon |
