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History of the Periodic Table: Difference between revisions
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== Introduction == | == Introduction == | ||
Before the creation of the periodic table, the elements first had to be discovered. After the discovery of pure substances, chemists begin to make a list of elements. This list grew until it had over sixty elements. Scientists begin to see patterns in elements, like color and density. John Newlands had the idea to arrange them by atomic weight, and it was Dmitri Mendeleev who accomplished this task. After that, the periodic table continued to grow, and the rules about it changed as elements were added and rearranged. Today the periodic table is an organized representation of all the elements we have discovered. Not many changes are being made anymore, but it continues to aid scientists in other discoveries and accomplishments. | |||
== Early Organizational Endeavors== | == Early Organizational Endeavors== | ||
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[[File:John Alexander Reina Newlands.jpg|left|thumb|150px|John Newlands (1837-98)]] | [[File:John Alexander Reina Newlands.jpg|left|thumb|150px|John Newlands (1837-98)]] | ||
In 1869, 63 elements had been discovered. As the number of elements grew larger, scientists begin to see certain patterns in the elements. <ref>Western Oregon University. [https://www.wou.edu/las/physci/ch412/perhist.htm A BRIEF HISTORY OF THE DEVELOPMENT OF PERIODIC TABLE] ''wou''. Accessed May 21, 2017</ref> In 1829 Johann Dobereiner observed that there were groups of elements with properties that were similar. Chlorine, bromine, and iodine were some of the elements that he saw similarities in. These elements were gases, had a similar color, and other similar qualities. Dobereiner begin to construct triads with the elements, but these eventually fell through and did not all fit together. <ref name=BJU>Batdorf, Brad. [The Periodic Table, Chapter 5] '' | |||
BJU Chemistry, Third Edition''. Published 2009.</ref> Then in 1864 John Newlands thought that the elements may be able to be arranged according to atomic weight. He tried to arrange them in order of increasing atomic weight. This idea would not work because it groups elements together that have different chemical properties. But, he did make take steps in leading to the creation of the periodic table. Newlands was the first person to add atomic numbers to the elements, which is on the periodic table to this day. <ref>Purdue. [http://chemed.chem.purdue.edu/genchem/history/newlands.html John Newlands] ''Purdue edu''. Accessed May 21, 2017.</ref> | BJU Chemistry, Third Edition''. Published 2009.</ref> Then in 1864 John Newlands thought that the elements may be able to be arranged according to atomic weight. He tried to arrange them in order of increasing atomic weight. This idea would not work because it groups elements together that have different chemical properties. But, he did make take steps in leading to the creation of the periodic table. Newlands was the first person to add atomic numbers to the elements, which is on the periodic table to this day. <ref>Purdue. [http://chemed.chem.purdue.edu/genchem/history/newlands.html John Newlands] ''Purdue edu''. Accessed May 21, 2017.</ref> | ||
