What is an Electron?
- An Electron is part of an atom. It is a negatively charged subatomic particle and it can be either free (not attached to any atom), or bound to the nucleus of an atom.
- symbol of an electron is: e− or β−
What is an atom?
- An atom a fundamental piece of matter. (Matter is anything that can be touched
physically.) Everything in the universe (except energy) is made of matter, and,
so, everything in the universe is made of atoms.
- An atom itself is made up of three tiny kinds of particles called subatomic particles: protons, neutrons, and electrons.
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