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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