Electrons and Positrons?

Question

why there are only negative electrons in atoms, what about Positrons? which is possitive. where are these positrons can be find?..are they in atoms too..or they exist somewhere,,can anyone tell me.

Answer 1

Positrons are antimatter counterpart of an electron. When they appear, they are quickly annihilated by some bit of regular matter, The only time they are seen is in particle colliders.

Basically, for some reason unknown, the universe is made of regular matter instead of antimatter because the universe seems to have formed with way more matter than antimatter, and all the antimatter has long been destroyed by regular matter. Therefore, no positrons.

Answer 2

By sign convention, electrons are negative and positrons are positive.  Electrons are found in a sort of "cloud" outside the nucleus of an atom (which is made up of positive particles called protons).  Positrons are one of the results of a process called beta decay, in which a proton becomes a positron (positive), a neutron (no charge), and a neutrino (no charge).

Answer 3

Positrons are usually created by the violent interaction of subatomic particles, and would be created by particle accelerators (and naturally by cosmic rays). Typically, this is a phenomenon know as "pair creation", where energy is converted to a particle and its anti-particle, very often an electron and an anti-electron, AKA a positron.

They are rather short lived as they quickly meet with electrons and this occurrence cause them to annihilate each other (releasing lots of energy -- at minuscule scale -- in the form of high energy gamma radiation).