1) Which scientist offered proof that atoms exist? a) John Dalton b) Aristotle c) Isaac Newton d) Democritus 2) In Rutherford's gold foil experiment the alpha particles pass through which part of the atom? a) the valence electron shell b) the proton shield c) the electron cloud d) the nucleus 3) The building blocks of matter are a) atoms and molecules b) electrons c) as of yet undiscovered d) none of these 4) In Thomson's plum pudding model the mass of the atom is in the a) matter between electrons b) electrons c) nucleus d) protons

Development of atomic theory

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