science model, a physical or mathematical representation of a system of ideas, events or processes., Thomson, plum pudding, Chadwick, discovered neutrons, Rutherford, nuclear model, Bohr's model, electrons circle nucleus in shells or orbitals, current model, electron cloud, why do scientist used atomic models, modeling atoms allows scientist to explore the behavior of atoms, has 2 protons, atomic mass, the number of protons plus neutrons, has 19 electrons

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