Mendeleev's classification was a great improvement over contemporary tabulation of the elements by Newlands and Lothar Meyer because
(i) it grouped the elements together more accurately in vertical columns.
(ii) it left gaps for elements which were yet to be discovered in nature.
(iii) it made possible the prediction of the properties of elements that had not yet been discovered.
(iv) it predicted that atomic masses of certain elements were incorrectly determined.
Text Solution
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Mendeleev arranged the elements in groups on the basis of similarities in the formulas of compounds formed by these elements. To ensure that the patterns in the properties of elements fitted the table, it was essential to leave spaces.
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