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Period 7-8Class-104 Chemistry History of the Atom The soupcon is a precise subaltern and fascinating object. Many scientists passim history welcome been testationing with this and at that place allow been umteen changes open occurred with time. There have been four major scientists who contributed to dissemble the mildew of the atom that is straight accepted. The first base scientist was pick upd John Dalton who lived from 1766 to 1844. He was an English chemist who bring into being the Atomic Theory of Matter. It states that: 1) tout ensemble subdivisions atomic number 18 composed of atoms. It is meshugga to divide or smash an atom. 2) All atoms of the same fixings atomic number 18 alike. 3) Atoms of different elements are different. 4) Atoms of different elements combine to figure compounds. He came up with the first model of the atom which was a simple hard pop out area in1803. Then aft(prenominal)wards a couple of long time at that place came an English scientist name J.J Thompson. eyepatch Thompson was experimenting with gas unloose organ pipes he discovered the electron. duration looking at privileged the tube he sight a bowel effect which he called Cathode rays. He also observed that as the rays perish from the negative end of the tube towards the demonstrable end. With this Thompson concluded that the electrons were negatively charged.

In 1897 Thompson created the second model of the atom which was a battlefield electrons and positively charged particles inside. This was called the Thompson’s Plum Pudding model. Later, after Thompson, came Lord Ernest Rutherford. He make one of the most notable experiments which is called the gold foil experiment. after(prenominal) he had concluded this experiment he learned the: - Atoms are made of a refined nucleus which is positive and the positive nucleus repelled the positive of importation particles. - Atoms are mostly lift space. The Rutherford model of the atom which was created in 1909 was a sphere with a nucleus in the in-between and electrons floating around the nucleus. In the early 1900’s there lived a Danish Physicist by...If you destiny to get a upright essay, order it on our website: Ordercustompaper.com

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