Proton: equals atomic number, charge = +1, found in the nucleus with neutrons, mass of 1, equals electron number, Neutron: charge = 0, different numbers in isotopes, mass of 1 like a proton, found in the nucleus, = mass number - atomic number, Electron: mass 0, found orbiting nucleus, charge = -1, arrangement found on p6 of data book, Argon 2,8,8,

S3 Atomic structure

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