Mendeleev organized the periodic table on the basis of the chemical and physical properties of the elements. These were the molecular formulae of hydrides and oxides of the elements, melting points, boiling points and densities of the elements and their hydrides and oxides. Mendeleev found that the elements with similar physical and chemical properties repeat after a definite interval. On the basis of this finding Mendeleev stated the following periodic law. Properties of elements are periodic function of their atomic masses. The vertical columns in the Mendeleev’s periodic table are called groups while the horizontal rows are called periods.
   (The general molecular formulae of compounds shown as R2O, R2O3, etc, in the upper part of Mendeleev’s periodic table, are written as R2O, R2O3, etc. in the present system.)

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08 December 2020 at 23:43