1) This is a negatively charged particle found outside the nucleus a) electron b) proton c) charm d) strange 2) The first person to propose a theory about an atom was a) Dalton b) Democritus c) Rutherford d) Aristotle 3) What scientist is best known for his "Plum Pudding" model of the atom? a) j.j. Thomson b) Dalton c) Ernest Rutherford d) Democritus

atomic theory

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