History Of The Periodic Table Of Elements

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Leonardo Miranda Mr. Tagami Chemistry 10/24/14 History of the Periodic Table of Elements The construction of the Periodic Table of Elements was prior to the discovery of the individual elements. Elements such as silver, gold, tin, copper, lead and mercury have been known for centuries. In 1649, the first scientific discovery of an element was made by Hennig Brand when he discovered phosphorous. Prior to Brand’s discovery, chemists had acquired an immense body of understanding concerning the properties of elements and their compounds for the next 200 years. By the year 1869, a collection of 63 elements had been revealed. As the number of known elements increased, scientists began to notice patterns in properties and formulate classification schemes. In 1862, a French geologist, A.E.Beguyer de Chancourtois, recorded a list of the elements on a cylinder regarding their individual atomic weights. He was the first to identify that elemental properties reoccur every seven elements. There has been some deviation on who deserves credit for being the “father” of the periodic table, either the German Lothar Meyer or the Russian Dmitri Mendeleev. Both chemists shockingly produced similar results during the same time period working individually. Meyer’s 1864 textbook included a shortened version of the periodic table, which contained about half of the known elements ordered by their atomic weight and valence charges. In 1868, Meyer assembled a prolonged version of the periodic
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