why Co and Ni are called misfit pair?
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He got success in placing all the elements in the periodic table. ... For example, Cobalt with atomic mass 58.93 was placed before Nickel with atomic mass 58.71 and so it became the anomalous pair in the Mendeleev's periodic table. Therefore the anomalous pair in Mendeleev's periodic table is Cobalt and Nickel.
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Explanation: The anomalous pair of elements are those elements which do not follow the increasing order of their atomic weight in the Mendeleev periodic table. Argon (Ar) and Carbon(C) are placed before the Potassium (K) and Nickel (Ni) respectively but they have comparatively higher atomic weight.
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