What is at the center of an atom?, Indivisible matter, A Nucleo, A lot of matter, What particles are in the nucleus?, Electrons and protons, Electrons, neutrons and protons, Protons and neutrons, What was the experiment that allowed us to know that the atom has a nucleus?, Cathode ray tube, X-ray crystallography, The gold foil experiment, Who was the scientist who made the gold foil experiment?, Dorothy Crowfoot, J.J. Thomson, Ernest Rutherford, What was the other famous scientific contribution of Ernest Rutherford?, That there are two types of radiation, The discovery of radioactive elements, That the atom has a nucleus

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