The First International Congress of Chemists took place in September 1860 in Karlsruhe, Germany to review scientific matters that there was little agreement to. Following this congress led to the development of the periodic table of elements. Top contributors to the periodic table included Staislao Cannizzaro, Dmitri Mendeleev, Henry Gwyn-Jeffreys Moseley, John William Strutt, William Ramsay, Friedrich Ernst Dorn, and Glenn Seaborg.
Stanislao Cannizzaro, born in 1826 and died in 1910, was an Italian chemist. He presented a method to measure atomic masses and to interpret the results of the measurements. Cannizzaro’s method aided scientists into agreeing standard values for atomic masses. The scientists then searched for relationships among atomic masses and other properties of the elements.
Dmitri Mendeleev, born in 1834, was a Russian chemist, and is sometimes considered as the ‘father of the Periodic Table’. Mendeleev was in the process of writing a chemistry textbook and he wanted to organize the elements according to their properties. Mendeleev created a table where elements with similar properties were grouped together. Mendeleev’s table left several empty spaces because there were elements that had not been discovered yet. Then in 1871, Mendeleev predicted the existence and properties of three elements. His predictions were a success and it led to scientists accepting his periodic table.
Henry Gwyn-Jeffreys Moseley, born in 1887, was an English scientist that discovered that atomic number, not atomic mass, was the basis for the organization of the Periodic Table. Moseley and Rutherford performed multiple experiments on 38 metals and Moseley discovered a pattern in which the positive charge of the nucleus increased by one unit from one element to the next when the elements are arranged as they are in the Periodic Table. His studies also led to the modern definition of atomic number and it provided... [continues]
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