Mendeleev's Periodic Table

In 1869, Mendeleav made a thorough study of the relation between the atomic weights of the elements and their physical and chemical properties. He then constructed a table in which elements were arranged in order of their increasing atomic weights.

It was also found that every eighth elements had properties similar to that of the first element. Thus, there was a periodic occurrence of elements with similar properties.

One of the most striking applications of Mendeleev’s classification of elements was that in his periodic table he left gaps for elements which were yet to be discovered. He also predicted the properties of these elements. However, Mendeleev’s periodic table did not provide any place for isotopes and noble gases which were discovered later on.