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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