Who proposed this model of atom?, James Chadwick, Ernest Rutherford, J.J. Thomson, Niels Bohr, Which particle have the least mass?, Electrons, Protons, Nucleus, Neutrons, Which particles make up the nucleus of an atom?, Electrons, Protons, Neutrons, Electrons & Protons, Neutrons & Protons, Which particle out of the 3 sub-particles of atom that have no charge?, Protons, Neutrons, Electrons, Nucleus, Who proposed the "Plum Pudding Model," discovering that atoms consist of a positively charged sphere with negatively charged electrons embedded within it?, John Dalton, J.J. Thomson, Niels Bohr, James Chadwick

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