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Period 7-8Class-104 Chemistry History of the Atom The atom is a precise subaltern and fascinating object. Many scientists throughout invoice welcome been experimentationing with this and at that place allow been many changes hold occurred with time. There have been four major scientists who contributed to make the seat of the atom that is flat accepted. The first scientist was named John Dalton who lived from 1766 to 1844. He was an side of meat chemist who create the Atomic Theory of Matter. It states that: 1) only subdivisions argon composed of atoms. It is impractical to divide or destroy an atom. 2) All atoms of the same element are alike. 3) Atoms of variant elements are different. 4) Atoms of different elements combine to signifier compounds. He came up with the first exemplar of the atom which was a simple hard surface battlefield in1803. Then after a couple of years in that location came an English scientist name J.J Thompson. eyepatch T hompson was experimenting with gas discharge electron tubes he discovered the electron. While looking at inside the tube he noticed a bowel movement which he called Cathode rays. He also observed that as the rays locomote from the prejudicial end of the tube towards the positive end. With this Thompson concluded that the electrons were negatively charged.

In 1897 Thompson created the second model of the atom which was a sphere electrons and positively charged particles inside. This was called the Thompson’s Plum Pudding model. Later, after Thompson, came lord Ernest Rutherford. He made one of the most renowned experiments which is called the bi! lls foil experiment. After he had concluded this experiment he learned the: - Atoms are made of a small nucleus which is positive and the positive nucleus repelled the positive of import particles. - Atoms are mostly empty space. The Rutherford model of the atom which was created in 1909 was a sphere with a nucleus in the mediate and electrons undirected around the nucleus. In the early 1900’s there lived a Danish Physicist by...If you want to get a dependable essay, rules of order it on our website: BestEssayCheap.com

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