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History of the Periodic Table: Difference between revisions
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[[File:DIMendeleevCab.jpg|right|thumb|150px|Dmitri Ivanovich Mendeleev (1834-1907)]] | [[File:DIMendeleevCab.jpg|right|thumb|150px|Dmitri Ivanovich Mendeleev (1834-1907)]] | ||
Almost all of the credit for the periodic table goes to [[Dmitri Mendeleev]]. He arranged the elements by their [[atomic mass]], like Newlands, but he did something different. He added in the elements that had not been discovered yet. He decided to do this because while he was studying the [[atomic masses]] he noticed that when they were put in order some of them increased more than others. <ref name=BJU/> He also arranged them vertically <ref>BBC. [http://www.bbc.co.uk/schools/gcsebitesize/science/add_edexcel/atomic_structure/periodictablerev1.shtml Atoms and the periodic table] ''BBC Science''. Accessed May 21, 2017.</ref>, and added the [[transition metals]]. He recognized that the [[transition metals]] did not fit into the chart so he separated them from the rest of the [[periodic table]]. Mendeleev summarized his work by writing the | Almost all of the credit for the periodic table goes to [[Dmitri Mendeleev]]. He arranged the elements by their [[atomic mass]], like Newlands, but he did something different. He added in the elements that had not been discovered yet. He decided to do this because while he was studying the [[atomic masses]] he noticed that when they were put in order some of them increased more than others. <ref name=BJU/> He also arranged them vertically <ref>BBC. [http://www.bbc.co.uk/schools/gcsebitesize/science/add_edexcel/atomic_structure/periodictablerev1.shtml Atoms and the periodic table] ''BBC Science''. Accessed May 21, 2017.</ref>, and added the [[transition metals]]. He recognized that the [[transition metals]] did not fit into the chart so he separated them from the rest of the [[periodic table]]. Mendeleev summarized his work by writing the periodic law. The law states, ''The properties of elements vary with their atomic masses in a periodic way.'' <ref name=BJU/> | ||
== The Modern Periodic Law == | == The Modern Periodic Law == | ||
