periodic table history

The history of the periodic mesa .Scientists tried for centuries to organize the eff 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 chemic ideas were scattered and non collected by any classification, but when Robert boil selected the concept of the element the Scientists were rushing to research for elements which To consider grouping on the basis of similarities and differences in its nature. The maturement 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 viewes are 40, 88, 137 and noted that the nuclear sight of Astranhim 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 altogether to a limited number of elements, however Dobreiner classification is weighty because it gave a new direction in the thinking of scientists .Newland was an English 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 wi! th an element the one-eighth 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 aforementioned(prenominal) time it has the same chemical properties so the Mendeleev table show that the arrangement...If you want to pop off a exuberant essay, order it on our website: BestEssayCheap.com

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