Related Clues:

• Noble gas in some lasers
• Colourless, odourless inert gas, Ar, used in some electric lights
• About one percent of the atmosphere
• Noble gas that's an anagram of "organ"
• Have left speaking; I don’t react
• First noble gas, alphabetically
• Gas used in insulating windows
• Inert gas whose name comes from the Greek for "lazy"
• Inert gas; groan (anag.)
• Gas somewhat dear, go nuclear
• Gas, one removed from air, almost disappeared
• Element in legalese judge denied
• Noble gas used in wine preservation
• It’s next to chlorine on the periodic table
• Most abundant noble gas in the earth's atmosphere