👉 An atomist is a concept in the field of quantum mechanics, specifically an imaginary particle or entity that is described as having no mass and being composed entirely of electric charge. This entity is referred to as "the electron" (or "electronium") in quantum physics, and it is often used to model particles that are not directly observable but have a significant effect on the behavior of the atom. In quantum mechanics, atoms are thought to be made up of discrete subatomic particles called electrons (pro