Q52Short answer
Give an account of the process adopted by Mendeleev ′ for the classification of elements. How did he arrive at “Periodic Law”? PERIODIC CLASSIFICATION OF ELEMENTS 47
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(Hint— 63 elements were known.) Compounds of these elements with oxygen and hydrogen were studied (formation of oxides and hydrides) Elements with similar properties were arranged in a group ′ M endeleev observed that elements were automatically arranged in the order of increasing atomic masses. 140 E XEMPLAR P ROBLEMS – SCIENCE %*#26'4 ANSWERS /WNVKRNG%JQKEG3WGUVKQPU