Atom

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An atom is the smallest unit of chemical elements, or ordinary matter, made up of a tiny nucleus ,

The size of an atom is about 10-10 m and it consists of a core (consisting of protons and neutrons) sized 10-14 m, and the electron shroud. The amount of electrons in this cloud tells us which element the atom represents. Electrons are bound to orbit the core electrically, and they follow the Exclusion Principle. These two things define the chemical properties of atoms.