Answer | Crossword Clue |
---|---|
INERT | Like krypton and argon |
NOBLE | Like argon or krypton |
INERT | Like argon or krypton |
GASES | Argon and krypton |
GASES | Argon and krypton, for two |
INERT | Like neon and argon |
INERT | Like helium and krypton |
INERT | Like xenon and krypton |
INERT | Like krypton and xenon |