Mendeleev took atomic masses of the
elements as the basis of classification of elements. He presented a periodic
law before classification. The periodic law can be stated in short that 'the
properties of the elements are a periodic function of their atomic masses.
He arranged the elements in the table in the increasing order of their atomic
masses. A number of gaps were left in the table for unknown elements and their
properties were predicted on the basis of periodic law. These properties helped
the future scientists to discover unknown elements.
However, there was violation of periodic law at a few places
to give proper position to certain elements on the basis of properties. The
position of these elements was justified when the periodic law was modified.
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