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The nucleus is at the center of an atom consisting mainly of protons and neutrons. It carries most of an atom's mass but occupies only a tiny space compared to the total size of the atom.
The number of protons in the nucleus of an atom, which determines the chemical properties of an element and its place in the periodic table.
Nucleons: Protons and neutrons collectively are known as nucleons.
A process by which an unstable atomic nucleus loses energy by radiation. It can involve the release of alpha or beta particles from the nucleus.