07 July 2015

CLASS XII CHEMISTRY

ADVANTAGES OF MENDELEEV'S PERIODIC LAW 

1.Prediction of new elements : While arranging the elements in order of increasing atomic masses in the periodic table , Mendeleev came across with certain positions where no known element was seen fit to him.He left those spaces vacant and predicted that new elements would be discovered which could be fit in those spaces.


2.Correction of atomic masses : At the time of Mendeleev the atomic masses of some elements were not correctly known . Mendeleev's classification of elements help to correct the atomic masses of the elements.

3. Prediction about properties : Mendeleev also made prediction about the properties of the unknown elements.Many of those predictions were later found correct.He was able to make these predictions because because the elements falling in the same group have same properties.

4. Unification of elements : Mendeleev's classification co-relates all the elements.The discovery of periodic classification showed that all the elements despite their apparent diversity are co-related with one another and make one systematic whole . Thus all the elements are unified through a classification.

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