| Answer | Crossword Clue |
|---|---|
| XENON | Colorless, inactive gas |
| ARGON | Inactive gas |
| OXAN | Colorless gas |
| XENON | Colorless gas |
| RADON | Colorless gas |
| ARGON | Colorless gas |
| PROPENE | Colorless gas. |
| ETHANE | Colorless gas |
| ETHENE | Colorless gas |
| NEON | Colorless gas. |
| KETENE | Colorless gas. |
| ETHANE | Colorless, odorless gas |
| KETEN | Colorless gas: Var. |
| OXAN | A colorless gas |
| ETHANE | Colorless fuel gas |
| XENON | Heavy, colorless gas. |
| SILICANE | Colorless, flammable gas |
| KETENE | Colorless, poisonous gas |
| ETHYLENE | Colorless, flammable gas |
| ARGON | Odorless, colorless, inert gas |
| OXAN | Colorless gas, in chemistry. |
| ETHANE | Colorless, odorless gas used as fuel |
| HCL | Colorless gas with a pungent odor, for short |
