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### 21 Cards in this Set

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 Johann Dobereiner -1829 -Model of Triods A.E. Beguyer de Chancourtois -1862 -Periodic Cylinder John Newlands -1863 -Law of octaves Dimitri Mendeleyev -1869 -Father of modern p. table -He published a table of the elements organized by increasing atomic mass Lothar Meyer -1869 -Published his own table of the elements organized by increasing atomic mass Mendeleev vs. Meyer -Both arranged the elements in order of increasing atomic mass -Both left vacant spaces where unknown elements should fit -Mendeleev used his table to predict the chemical properties of 3 elements that were unknown -Mendeleev ended up being very accurate and after the discovery of these elements Mendeleev's table was generally accepted. Mendeleev's 15 minutes of fame -Great accomplishment but problems arose when new elements were discovered and more accurate atomic weights were determined. Henry Moseley -1913 -Determined the nuclear charge (atomic #) of elements and rearranges them by increasing atomic number. Glenn T. Seaborg -1951 -He proposed a new p. table by moving 14 elements out of the main body to the bottom. He called it the Actinide series. Periods Horizontal rows in p. table Groups Vertical columns, also called families. Periodic Law When elements are arranged in order of increasing atomic number, there is a periodic pattern in their physical and chemical properties. Model of Triods 1829 Johann Dobereiner Periodic Cylinder -Ordered the elements by increasin atomic height. A.E. noticed a pattern in closely related elements in every 16th space -A.E. Beguyer de Chancourtois Law of Octaves -Law states that "any given element will exhibit analogous behavior to the eighth element following it in the table.\ -John Newlands This person published a table of the elements organized by increasing atomic mass -Dmitri Mendeleyev This person published his own table of the elements by increasing atomic number but was eventually forgotten. -Lothar Meyer Father of the modern P. table -Dmitri Mendeleyev Why was Mendeleyev more succeful than Meyer Both left spaces but Mendelyeve predicted open spaces and was right This person determined that the nuclear charge of elements and rearranges them by increasing atomic number Moseley This person proposed a new p. table by moving 14 elements out of the main body to the bottom. He called it the Actinide sets -Glenn T. Seaborg