Noble gas used in some lasers (5)
I believe the answer is:
xenon
(Other definitions for xenon that I've seen before include "Inert 18" , "Inert gas, Xe" , "member of nobility?" , "One of the noble gasses" , "One of the noble set" .)
I believe the answer is:
xenon
(Other definitions for xenon that I've seen before include "Inert 18" , "Inert gas, Xe" , "member of nobility?" , "One of the noble gasses" , "One of the noble set" .)