Atom, the basic, fundamental building block of ordinary matter,, Proton, A positively charged subatomic particle located in the nucleus, Neutron, A neutrally charged subatomic particle located in the nucleus, Electron, A subatomic particle with a negative electric charge located outside of the nucleus, Nucleus, the small, dense, positively charged region at the center of an atom, containing over 99.9% of its mass

Atomic structure

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