| Heavy gas |
| Noble gas |
| Light gas |
| Inert gas |
| Element 54 |
| It's noble |
| It's a gas |
| TV-tube gas |
| A noble gas |
| Arc-lamp gas |
| An inert gas |
| Odorless gas |
| 132 Inert gas |
| Flashlamp gas |
| Flashtube gas |
| Inert gas, Xe |
| Headlight gas |
| Colorless gas |
| Unreactive gas |
| Flash lamp gas |
| Flash tube gas |
| Radio tube gas |
| Stroboscope gas |
| TV-tube element |
| Heavy noble gas |
| Gaseous element |
| Heavy, inert gas |
| Relative of neon |
| Strobe light gas |
| TV tube material |
| Gas in arc lamps |
| Atomic number 54 |
| Flash lamp filler |
| Gas used in tubes |
| Radio tube filler |
| Flashbulb element |
| Element number 54 |
| Bubble-chamber gas |
| Gas for headlights |
| Gas in an arc lamp |
| Gas used in lasers |
| Periodic table's 54 |
| Hard-to-combine gas |
| Element in arc lamps |
| Gas in strobe lights |
| Gas used in TV tubes |
| Strobe light element |
| Element in headlights |
| Filling for a TV tube |
| Gas in the atmosphere |
| Heavy gaseous element |
| It doesn't react well |
| Kin of argon and neon |
| Gas used in arc lamps |
| Gas in some headlights |
| Gas in an ion thruster |
| Gas used in flashtubes |
| Gas used in headlights |
| Gas used in some lamps |
| Photographic flash gas |
| Gas discovered in 1898 |
| One of the noble gases |
| Colorless, inactive gas |
| Gas used in flash lamps |
| Noble gas in some lamps |
| Plasma screen component |
| Element in strobe lights |
| 54" on the periodic table |
| Element in many arc lamps |
| Second-heaviest noble gas |
| Gas used in plasma screens |
| Colorless, gaseous element |
| It's often in the spotlight |
| Propellant in ion thrusters |
| This, on the periodic table |
| Chemical used in anaesthesia |
| Fifth member in a noble line |
| Noble gas discovered in 1898 |
| Noble gas used in some lamps |
| It might be in the spotlight |
| Element in some electric lamps |
| Gaseous element used in lasers |
| Inert gas used in radio valves |
| It's 54, periodically speaking |
| Element in some auto headlights |
| Only element that starts with X |
| Noble gas that has the symbol Xe |
| Gaseous element in our atmosphere |
| First inert gas made into a compound |
| Gas present in the Martian atmosphere |
| Gas used in high-intensity headlights |
| It follows iodine in the periodic table |
| Element from the Greek word for "strange |
| It's under krypton on the periodic table |
| Element above radon in the periodic table |
| Element named from the Greek for "strange |
| Element next to iodine in the periodic table |
| Element next to iodine on the periodic table |
| 1980s Big Apple nightclub with a chemical name |
| Gas whose name comes from the Greek for "strange |