The positive charges are called protons, and the negative charges are called electrons.
Atoms, the tiny, invisible particles that make up every substance around us, contain even smaller particles called electrons.
Cathode rays were made of tiny, negatively charged particles, which he called electrons.
Atoms themselves are made up of three kinds of smaller particles, called protons, neutrons and electrons.
Electricity, first thought to be a fluid, was now understood to consist of particles called electrons.
Electron beam radiation therapy uses tiny negatively charged particles called electrons.
Negatively-charged particles called electrons surround the nucleus, moving quickly around it within the confines of an energy shell.
This is a type of radiation treatment in which the skin over the whole body is treated with rays of tiny particles called electrons.
In metals, the electrons with no binding energy are called free electrons.
When the atoms in a gas are broken up, the pieces are called electrons and ions.