| Answer | Crossword Clue |
|---|---|
| GASES | Krypton and oxygen |
| GASES | Krypton and oxygen, e.g. |
| RAREGASES | Krypton and others |
| ELEMENTS | Krypton and xenon |
| GASES | Krypton and such |
| GASES | Argon and krypton |
| GASES | Krypton and xenon |
| GASES | Radon and krypton |
| GASES | Xenon and krypton |
| GASES | Krypton and methane |
| RAREGASES | Krypton and xenon |
| GASES | Krypton and others |
| INERT | Like xenon and krypton |
| INERT | Like helium and krypton |
| INERT | Like krypton and argon |
| INERT | Like krypton and xenon |
| GASES | Argon and krypton, for two |
| GASES | Xenon and krypton, for two |
| GASES | Krypton and xenon, e.g. |
