muonium

[myoo-oh-nee-uhm]

mu·o·ni·um

[myoo-oh-nee-uhm]
noun Physics.
an electron and a positively charged muon bound together by electrical attraction in the same manner as the electron and proton in a hydrogen atom.

Origin:
1955–60; mu(on) + -onium, probably extracted from positronium
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2012.
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Muonium is always a great word to know.
So is atom. Does it mean:
a sequence of changing states that produces a final state identical to the original one; one of a succession of periodically recurring events
the smallest component of an element having the chemical properties of the element; the number of protons determines the identity of the element
Encyclopedia Britannica
Encyclopedia

muonium

short-lived quasi-atom composed of a positive muon (an antiparticle), as nucleus, and an ordinary negative electron. It is formed when a positive muon captures an atomic electron after being slowed down in matter. Muoniums form a few compounds with gases such as nitrogen dioxide and ethylene. Muonium research throws some light on the puzzling nature of muons (essentially heavy electrons) and their relation to ordinary electrons.

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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