Question

what is a poistron?explain

Answer 1

an elementary particle having the same mass and spin as an electronbut having a positive charge equal in magnitude to that of the electron's negative charge; the antiparticle of the electron.

Answer 2

A positron is a particle of matter with the same mass as an  electron but an opposite  charge . It is a form of antimatterbecause, when a positron encounters an electron, the two completely annihilate to yield  energy .The existence of the positron was predicted in 1928 by physicist Paul Dirac, and positrons were discovered experimentally in 1932 by physicist Carl Anderson.