| Answer | Crossword Clue |
|---|---|
| XENON | Gas used in TV tubes |
| XENON | Gas used in tubes |
| ARGON | Gas used in light tubes |
| ARGON | Inert gas used in vacuum tubes |
| ARGON | Gas used in light bulbs, radio tubes, etc. |
| YTTRIA | Powder used in color TV tubes |
| strontium | a soft malleable ductile metallic element of the alkaline-earth group occurring only in combination and used especially in color TV tubes, in crimson fireworks, and in the production of some ferrites see element table |
