Positronium

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An example of a Positronium atom, with a positron and an electron in the same orbital

Positronium is an onium, a type of exotic atom that is made of a particle and its antiparticle. In Positronium, one positron and one electron are bonded together. The positron replaces a proton that would normally be present in a Hydrogen atom. They both stay in the same orbital. A few nanoseconds after it is created the Positronium is destroyed and it forms two gamma rays.