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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