Electron

Definition

An electron is a subatomic particle with a negative charge found outside an atomic nucleus.

Related terms

Proton:

A proton is another subatomic particle found within the atomic nucleus but carries a positive charge.

Neutron: A neutron is also found within the atomic nucleus but has no charge.

Atomic Nucleus: The central part of an atom that contains protons and neutrons. It acts as the "core" holding everything together.