periodic table history

The history of the periodic circuit board .Scientists tried for centuries to organize the love facts to them in a way which can result a particular system helping them easier to study, and discovering new facts , until the seventeenth vitamin C the chemical substance ideas were scattered and non collected by each classification, but when Robert boil selected the concept of the element the Scientists were rushing to grimace for elements which To consider grouping on the backside of similarities and differences in its nature. The developing of the periodic table Classifying the elements into two groups metals and non-metals .Dobreier triangles: Classification of the elements on the basis of the descent between the blocs of nuclear components and chemical properties prepare in this sphere that the German metals calcium, barium and Alastranhim have similar chemical properties and nuclear flockes are 40, 88, 137 and noted that the atomic can of As tranhim about(predicate) equal to the average atomic mass of calcium and barium also found that this relationship Valid elements of lithium and atomic number 11 and potassium as well as elements of chlorine and atomic number 35 and iodine. .Dobreiner classification did not last long and the reason is because it does not apply provided to a limited number of elements, however Dobreiner classification is heavy because it gave a new direction in the thinking of scientists .Newland was an face chemical scientist that arranged the elements that was known to him in 1864 and it was 62 elements depending on the increment of the atomic mass and found that if it started with an element the 8th element will have it homogeneous properties. .Mendeleev table : in 1869 the Russian scientist Dimitry Mendeleev depended on the idea of Newlands in arranging the elements in horizontal courses and vertical groups depending on the increase of its atomic mass and at the aforemention ed(prenominal) time it has the same chemical! properties so the Mendeleev table show that the arrangement...If you want to pop off a dear essay, order it on our website: BestEssayCheap.com

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