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The Atomic Theory In this report I will give a history on the development of the atomic theory I will cover some of the most important dates in the development of atomic theory An atom was first thought of by the Ancient Greeks who believed that matter was made of smaller particles called elements The name they gave to these particles was the atom In 1776 the man known as The Father of Atomic Theory John Dalton was born in England He is known as the father of atomic theory because he is the one who discovered many of the different masses for different elements he also discovered the different proportions which molecules are formed in Dalton also discovered the inert gases and their failure to react with other substances In 1969 a Russian chemist named Mendeleyev who a renowned teacher developed the periodic law of the properties of the chemical elements which states that elements show a regular pattern when they are arranged according to their atomic masses Mendeleyev wrote a two-volume book called Principles of chemistry 1868-1870 which later became a classic These books included an improved version of the periodic table Sir Joseph Thomson another important person in the development of the atomic theory was born in 1906 Thomson won the Nobel Prize in physics 1906 for his work in the conduction of electricty through gases He discovered the electron by using cathode rays An electron is the smallest particle of an atom the charge on an electron is negative Ernest Rutherford who was born in 1871 identified the three main components of radioactivity alpha beta and gamma particles Radioactivity was discovered by a French scientist named Becquerel Rutherford was also the first one to disdcover the true structure of an atom An atom has a central heavy nucleus with an electron cloud surrounding
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