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Created with Fabric.js 1.4.5 Timeline of Atom Developement 1800's John Dalton began his work in the early 1800's. His experiments led to the initial acceptance of the atom.During his early career, he identified the hereditary nature of red-green color blindness. In 1803, Dalton created the first chart of atomic weights. 1861 In 1913, Niels Bohrproposed that electronsorbited the nucleus, likeplanets around the sun. He was the first to discover that electrons travel in separate orbits around the nucleus. He also proposed that the number of electrons in the orbit determines the properties of an element. Also, the chemical element bohrium is named for him. In 1861, the scientist William Crookes discovered the electron by reconstructingthe Cathode Ray. He put blackvanes on one side of the tube and silver on the other side of the tube, which caused the tube to spin. When it spun, some objects in he tube were negative when hitting the tube and those objects were electrons. He called his tubeCrookes Tube. 1913 In 1892, a scientist named JJ Thompson began an experiment that first hinted that atoms are made up of smaller particles.He originally called these particles 'corpuscles,' although they are now called electrons He proved that atoms ARE divisible. He stated that atoms are madeup of positively and negativelycharged particles. In 1908, a scientist named Ernest Rutherford discovered the nucleus. He statedthat the nucleus was the dense,small, positively charged centerof the atom. Rutherford became Director of the Cavendish Laboratory at Cambridge University in 1919 and under his leadership the neutron was discovered by James Chadwick in 1932. Also, the chemical element rutherfordium was named after him in 1997. 1908 1892
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