How could Modern periodic table remove anamas of mendleev periodic tab

1.	How could Modern periodic table remove anamas of mendleev periodic table ?
Answer» 1) Isotopes of an elements occupy same position in the periodic table due to same atomic number.2) There is a logical separation of elements into subgroups.3) It is based upon the fundamental property of an element i.e. atomic number.4) In the Modern Periodic table elements are arranged in the increasing order of their atomic number, removing the anomaly regarding certain pairs of elements in Mendeleev\'s periodic table.5) Atomic number of cobalt is 27and nickel is 28. Hence cobalt will come before nickel even though its atomic mass is greater.

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