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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 accounting welcome been experimentationing with this and at that place allow been many changes puzzle occurred with time. There have been four major scientists who contributed to make the flummox of the atom that is flat accepted. The first scientist was named John Dalton who lived from 1766 to 1844. He was an position chemist who create the Atomic Theory of Matter. It states that: 1) each subdivisions are composed of atoms. It is impractical to divide or destroy an atom. 2) All atoms of the same element are alike. 3) Atoms of incompatible elements are different. 4) Atoms of different elements combine to signifier compounds. He came up with the first mould of the atom which was a simple hard surface world in1803. Then after a couple of years thither came an English scientist name J.J Thompson. eyepatch Thompson was experimenting with gas discharge thermionic valves 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 interdict 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 master copy Ernest Rutherford. He made one of the most ren owned experiments which is called the golde! n foil experiment. After he had concluded this experiment he learned the: - Atoms are made of a small core group 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 aimless around the nucleus. In the early 1900’s there lived a Danish Physicist by...If you want to get a dependable essay, locate it on our website: BestEssayCheap.com

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