+Nuclei are the tiny, dense hearts of [Atom](/wiki/atom)s, housing protons and neutrons. This core determines an element's identity and its fundamental [Atomic Mass](/wiki/atomic_mass), governing much of its interaction with the world. Though incredibly small, they contain almost all of an atom's mass and energy.
+## See also
+- [Proton](/wiki/proton)
+- [Neutron](/wiki/neutron)
+- [Electron](/wiki/electron)
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