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Thomson’s Atomic Model Varsha Sharma & Leanna Ng Block H Sir Joseph John Thomson 1856-1940 • Was a physics professor at Cambridge University • Was Ernest Rutherford’s teacher • Won the Nobel Prize for Physics in 1937 • Sir Joseph John Thomson What Did he Discover? • 1897, atoms made of evenly distributed electrons in a positive jelly • Called electrons “corpuscles” • Also believed that Cathode rays are streams of electrons • Invention of mass spectrometer • Discovery of isotopes • Thomson’s Model of the Atom What Common Things is his Atomic Model Compared to? • • • Plum pudding A Blueberry muffin A Chocolate chip cookie In the picture: • • “chocolate chips” are electrons “dough” is positively charged How did Thomson’s Model Connect to Past Models? • Thomson disproved that atoms had no internal structure and are indivisible • Discovered method for separating different kinds of atoms and molecules by using positive rays • Democritus’ Model of the Atom How did Thomson’s Model Connect to Future Models? • Ideas about separating atoms and molecules led to discovery of isotopes • Discovery of electrons led to Rutherford’s model, which disproved Thomson’s model • Discovered positively charged nucleus surrounded by electrons • Nucleus made of neutrons and protons • Electrons around nucleus made atom neutrally charged