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To better understand antimatter, one needs to know more about matter. Matter is made up of atoms, which are the basic units of chemical elements such as hydrogen, helium or oxygen. Each element has a certain number of atoms: Hydrogen has one atom; helium has two atoms; and so on.
The universe of an atom is complex, as it is full of exotic particles with properties of spin and "flavor" that physicists are only just beginning to understand. From a simple perspective, however, atoms have particles that are known as electrons, protons and neutrons inside of them.