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| 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 |
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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