electron
subatomic particle with negative charge
unpaired electron
electron occupying an orbital by itself rather than in a pair
photoelectron
electron emitted through light impacting a material (photoelectric effect)
core electron
electrons in an atom's inner shells, which do not participate in chemical bonding
valence electron
outer shell electron that is associated with an atom, and that can participate in the formation of a chemical bond if the outer shell is not closed
Auger electron
electron emitted by the Auger effect
secondary electron
electron generated as ionization product