Proton, Found in the nucleus and has a relative charge of +1., Neutron, Found in the nucleus and has a relative charge of 0., Electron, Found in shells and has a relative charge of -1., Nucleus , Where protons and neutrons are located., Shells, Where electrons are located., Ion, an atom or molecule with a net electric charge due to the loss or gain of one or more electrons., Isotopes, Atoms with the same number of protons but different number of neutrons., Atom, The smallest part of an element that can exist..

Atomic structure

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