![]() To test the stability of Thomson’s atomic model, Rutherford carried out the now famous gold-foil experiment. In other words, many scientists including his student, Rutherford, had no confidence in his model. Some scientists questioned the stability of an atom based on his model. The ancient atomic theory was proposed in the 5th century bce by the Greek philosophers Leucippus and Democritus and was revived in the 1st century bce by the Roman philosopher and poet Lucretius. What questions did critics ask about his atomic model? Notice, the electrons are the negatively charged particles, and these particles are embedded in the positively charged sphere (grey matter). How did he come to this conclusion? He had observed that no matter the metals he used as electrodes, the cathode-rays properties never changed.įrom these conclusions, Thomson modified Dalton’s atomic theory and proposed a new atomic model popularly known as “plum pudding”, and this model appear in Figure 1.
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