| Answer | Crossword Clue |
|---|---|
| GASES | Neon and helium |
| GASES | Helium and neon |
| GASSES | Helium and neon |
| INERT | Like helium and neon |
| INERT | Like neon and helium |
| RAMSAY | Discoverer of helium and neon |
| RAREGASES | Helium and neon, e.g. |
| GASSES | Helium and neon, e.g. |
| GASSES | Helium and neon, for two |
| GASHOPPERS | Pogo sticks made of neon and helium? |
| GAS | Neon or helium |
| INERTGAS | Neon or helium |
| GAS | Helium or neon |
| INERTGAS | Helium or neon |
| NOBLEGASES | Helium, neon, et al. |
| INERT | Like neon or helium |
| INERT | Like helium or neon |
