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Classification of elements part ii

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Part - II Modern periodic table concept: Mendeleev’s periodic table suffered a number of defects when elements were arranged on the basis of increasing atomic mass. To remove all the defects of his periodic table, in 1913, Henery Mosley observed that the physical and the chemical properties of the elements are determined by their atomic number. It leads to the formation of modern periodic table. According to Mosley concept the elements should be arranged on the basis of their increasing atomic number. On doing so all the defects of Mendeleev’s periodic table would be eliminated and atomic number is the main basis to determine the property of the elements. Arranging the elements on the basis of increasing atomic number Mosley gave the law, which is called Modern periodic law (Mosley periodic law).  Modern Periodic Law: Modern periodic law states that, “the physical and the chemical properties of the element are the periodic function of their atomic number.” It means if the elements are arranged on the basis of their increasing atomic number, the properties of the elements are repeated after a regular intervals or periods.  Features of Mendeleev’s periodic table: a) The elements were classified on the basis of the increasing order of their atomic number. b) Groups: The vertical column of the elements in the periodic table is called group. The elements fall under the same show similar properties. There are altogether 18 groups in modern periodic table. The gro ...
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