| Answer | Crossword Clue |
|---|---|
| ARGON | Gaseous element in the air. |
| XENON | Gaseous element used in lasers |
| ARGON | Gaseous element in our atmosphere |
| XENON | Gaseous element in our atmosphere |
| ARGON | Element in air |
| XENON | Element in air. |
| ARGON | Element in air. |
| XENON | Trace element in air |
| BARIUM | Element that quickly oxidizes in air |
