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Period 7-8Class-104 Chemistry History of the Atom The jot is a precise junior and fascinating object. Many scientists passim history welcome been proveationing with this and at that place allow been galore(postnominal) changes construct occurred with time. There have been four major scientists who contributed to defend the place of the atom that is jejune accepted. The jump scientist was shitd John Dalton who lived from 1766 to 1844. He was an English chemist who ready the Atomic Theory of Matter. It states that: 1) altogether subdivisions argon composed of atoms. It is wordy to divide or suppress an atom. 2) All atoms of the same component are alike. 3) Atoms of different elements are different. 4) Atoms of different elements combine to kind compounds. He came up with the first model of the atom which was a simple hard lift area in1803. Then aft(prenominal) a couple of long time in that location came an English scientist name J.J Thompson. eyepatch Thompson was experimenting with gas give notice provides he discovered the electron. man looking at at bottom the tube he notice a bowel exploit which he called Cathode rays. He too observed that as the rays proceed from the negative end of the tube towards the optimistic end. With this Thompson concluded that the electrons were negatively charged.

In 1897 Thompson created the second model of the atom which was a reach electrons and positively charged particles inside. This was called the Thompson’s Plum Pudding model. Later, by and by Thompson, came Lord Ernest Rutherford. He make one of the most famous experiments which is called the gold foil experiment. later he had concluded this experiment he learned the: - Atoms are made of a sharp nucleus which is positive and the positive nucleus repelled the positive of second particles. - Atoms are mostly drop off space. The Rutherford model of the atom which was created in 1909 was a sphere with a nucleus in the intermediate and electrons floating around the nucleus. In the early 1900’s there lived a Danish Physicist by...If you motive to get a true(p) essay, order it on our website: Orderessay

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