The History of the Periodic Table Essay

1174 Words Dec 3rd, 2007 5 Pages
Since the ancient times, people like the Greeks were acknowledged of the existence of elements, but only knew of common ones like gold, tin, and copper. It wasn't until the middle of the nineteenth century when about 50 elements were discovered and scientists began to wonder if the elements vary from each other or if a pattern is represented in the arrangement of the elements. A number of scientists tried different kinds of patterns. For example, the German scientist Johann Wolfgang Döbereiner tried grouping the three halogens elements (chlorine, bromine, and iodine) in a consecutive order of atomic weights. The idea of putting the elements together finally took shape when the two scientists, Dmitry Mendeleev and Julius Lothar Meyer …show more content…
The earliest attempt in assembling the elements started with Johann Döbereiner. Through his works, he discovered that certain elements can be grouped in threes. The pattern he found in this concept was that the atomic weight of one element of a group is midway between the atomic weights of the other two elements. Based on this concept, the law he found was the law of triad in 1829. The scientist, Alexandre-Émile Beguyer de Chancourtois, was another scientist that made an attempt to group all the elements together in an order. He made a spiral graph that is plotted on a cylinder and put the elements in an order of increasing atomic weight in 1862. Unfortunately, his ideas were ignored by chemists because they were written in geologic terms. Lastly, the scientist, John Newlands proposed his ideas of arranging the elements together based on the atomic weight. Through his works, he discovered that every eighth element has similar properties and created the Law of Octaves. The periodic table was finally created by Mendeleev and Meyer and was revised later by other scientists. Meyer first introduced the idea of the periodicity of atomic volume against the atomic weight. Using this idea, he created a graph showing a series of sharp peaks. He found that elements with similar chemical properties take place at comparable points on the various peaks. The periodic table that Mendeleev created allowed him to predict new elements because after all the elements were

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