Define Periodicity also define Lother Meyer’s Classification.

Define Periodicity also define Lother Meyer’s Classification.
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1 Answer

Answer :

Ans : Periodicity :
Periodicity of elements is define as the recurrence of chemical & physical properties of elements at regular intervals.
Lother Meyer’s Classification :
In 1869 Lother Meyer arranged elements in nine vertical columns or groups & laid down the emphasis on their physical properties. He also calculated the atomic volumes of elements & plotted a graph between increasing atomic volumes & atomic masses. From the graph he concluded that the elements with similar properties occupy similar positions in graph.
Example :
The highly reactive alkali metals occupy the peaks of graph showing they possess largest atomic volumes.
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