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How were the positions of cobalt and nic...

How were the positions of cobalt and nickel resolved in the Modern Periodic Table?

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Cobalt has atomic number 27 and atomic mass 58.9 while Nickel has atomic number 28 and atomic mass 58.7. In Mendeleev.s Periodic Table in which elements are arranged in increasing order of their atomic masses, Cobalt was placed before Nickel violating the periodic law. In Modern Periodic Table in which elements are arranged in increasing order of their atomic numbers, Cobalt is rightly placed before Nickel.
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  1. How were the positions of cobalt and nickel resolved in the Modern Per...

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