Apositron (also called anantielectron) is theantimatter version of anelectron. It has the samemass andspin as an electron. However, it has a positiveelectric charge, whereas an electron has a negative charge. Like all antimatter, when it meets its so-called counterpartner, each are annihilated and turned into energy. The electron and positron disappear, and the total mass decreases. There is no name for this type ofenergy, as it is neither mechanical, radiation, chemical, electrical, nuclear, nor thermal. Although the energy does emit lightphotons when annihilated, it is converted from some form of energy that has not been named.
A positron also very rarely makes a structure calledpositronium. Positronium is like anatom in many ways, but is veryunstable, and usually quickly annihilates.
