| Answer | Crossword Clue |
|---|---|
| ELEMENT | Helium, for one. |
| INERTGAS | Helium, for one |
| GAS | Helium, for one |
| INERT | Adjective for helium. |
| ATNO | 2, for helium: Abbr. |
| MYLAR | Reflective material for helium balloons |
| GASES | Oxygen and helium, for instance |
| GASSES | Helium and neon, for two |
| ATNO | 1 for hydrogen or 2 for helium: Abbr. |
