Muonium

Simplified drawing of the muonium atom
A muonium atom

Muonium (/mjuː.ˈoʊ.ni.əm/, mew-OH-nee-əm) is an exotic atom made up of an antimuon and an electron, which was discovered in 1960 by Vernon W. Hughes and is given the chemical symbol Mu. During the muon's 2.2 µs lifetime, muonium can undergo chemical reactions.

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