Inert gas in air (5)
I believe the answer is:
argon
(Other definitions for argon that I've seen before include "elementary" , "noble element" , "Inert gas, present in small amounts in the air" , "Inert gas, symbol Ar" , "Inert eighteen ac gas" .)
I believe the answer is:
argon
(Other definitions for argon that I've seen before include "elementary" , "noble element" , "Inert gas, present in small amounts in the air" , "Inert gas, symbol Ar" , "Inert eighteen ac gas" .)