| METHANE | Name a colourless, odourless, flammable gas (7) |
| OXYGEN | Name a colourless, odourless, gaseous element (6) |
| BENZINE | Name a colourless, flammable liquid obtained in the distillation of petroleum (7) |
| ETHANE | A colourless, odourless flammable gas that is a constituent of petroleum (6) |
| PROPANE | Colourless, odourless flammable alkane occurring in petroleum, used in liquefied form as a fuel (7) |
| HYDROGEN | A colourless, odourless gas whose name derives from the Greek for 'water forming' (8) |
| ARGON | A colourless, odourless gas (5) |
| NEON | A colourless, odourless inert atmospheric gas chiefly used in display singns |
| HELIUM | A colourless, odourless gas sometimes used for car airbags (6) |
| MONOXIDE | Carbon _ _ _ _ _ _ _ _ , a colourless, odourless, very toxic gas formed from the incomplete combustion of carbon (8) |
| NITROGEN | A colourless, odourless gas that produces ammonia when reacted with hydrogen (8) |
| RADON | A colourless, odourless gas that decays into radioactive polonium and alpha particles (5) |
| CARBONMONOXIDE | A colourless, odourless toxic gas given off by burning fuel, e.g. exhaust from cars (6,8) |
| XENON | A colourless, odourless Plastikman alias (5) |
| BUTANE | Colourless highly flammable gas used as a lighter fluid (6) |
| ETHYLENE | Colourless flammable gas of the alkane series obtained from petroleum and natural gas and given off by ripening fruit (8) |
| ETHENE | Flammable gas also called olefiant gas |
| ACETYLENE | Colourless flammable gas used in welding (9) |
| FIREDAMP | A flammable gas found in coal mines (8) |
| SILICANE | Colorless, flammable gas |
