Answer | Crossword Clue |
---|---|
INERT | Like argon or krypton |
NOBLE | Like argon or krypton |
INERT | Like krypton and argon |
GAS | Argon or krypton |
INERT | Like argon or helium |
INERT | Like neon or argon |
INERT | Like argon or neon. |
INERT | Like argon or neon |
INERT | Like helium or argon |
INERT | Like neon or krypton |
INERT | Like krypton or xenon |