Atom History

History of the annual submit In the beginning l l Between 1863 and 1866 John Newlands showed that by assigning hydrogen an arbitrary mass of 1 and ordering the cognise elements by their masses, every eighth element shared a common set of properties. First attempt was done in the 1820s, scarce the real fun started to happen in 1850s and 1860s. l l Chemists were starting to kick downstairs a chaw of elements. 52 by 1817 and that number uprise to 62 by 1863. Some kind of organization was call for, tho 1817 was too early. Chemists needed to refine their skills. 1857 W illiam Odling separated the known elements into 13 groups base on their physical and chemical properties. (It was a start) A find! l 1869 would be the year Russian chemist, Dimitri Mendeleev published a method of organizing the elements according to both their masses and their properties. l l l Mendeleev showed that when the elements are listed acc ording to masses, certain properties pass PERIODICALLY. l He broke the list into a series of rows (PERIOD) and columns (GROUP). He called this the law of octaves Newlands work was good, but failed to predict elements. Plus, the he could not make up his mind. He kept ever-changing the elan he ordered elements.

1 Dmitri Mendeleev 1834-1907 Born in Siberia- last of 14 children First to make a power point table Dmitri Mendeleevs Original Table l He placed elements in certain groups based on their properties in suffer of contrary indications by its mass l Mendeleev left wing gaps in his table for elements, which he proposed had yet to be discovered. l He was able to predict the properti! es and characteristics of the undetected elements so accurately that when they were discovered the predicted value was quite exact. Modern Periodic Table l Is organized according to atomic number sort of than atomic mass. (This solved the problems where different isotopic...If you want to get a all-inclusive essay, order it on our website: OrderEssay.net

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