PROTON has a positive charge. In certain elements there is proton emission possible. Refer to radioactive elements in detail to get exact answer to your question.

a proton and an electron

Single proton (or photon) emission computed tomography (SPECT) allows a physician to see three-dimensional images of a person's particular organ or body system.

Emission Nebula is an ionized gas cloud that shines in various colors. Its ionization is from the high energy proton released by its neighboring star.

This particle is a neutron:
neutron-----------proton + electron + neutrino