Until 2000, its atoms were thought not to combine with each other or any other element and could only be trapped mechanically in cavities of other substances.
Until 2000, its atoms were thought not to combine with each other or any other element and could only be trapped mechanically in cavities of other substances. The first noble gas discovered on Earth, Cavendish predicted it, but it wasn't found until 1894 when a gas remained after nitrogen and oxygen were removed from air. Mixed with nitrogen in incandescent light bulbs, its only source is the atmosphere, of which it makes up .93 percent. For ten points, name this element named for its inertness whose symbol was A until the Fifties and is now Ar.
Until 2000, its atoms were thought not to combine with each other or any other element and could only be trapped mechanically in cavities of other substances.
{Argon}