Write short notes on Mendeleev’s periodic law.


The periodic table was organised by Mendeleev according to the chemical and physical properties of the elements. These were the molecular formula of the hydrides and oxides of the elements, melting points, boiling points and densities of the elements and their hydrides and oxides. Mendeleev determined that the elements with similar physical and chemical properties repeat after a definite interval. So, as per this finding he stated the following periodic law that properties of elements are periodic functions of their atomic masses. The vertical columns in the Mendeleev’s periodic table are the groups while the horizontal rows are known as periods.

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