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21 Cards in this Set

  • Front
  • Back
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