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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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On the basis of atomic masses, Ni (58.7) should be placed before Co (58.9). This was a defect in Mendeleev.s table.
because the element Co was placed before Ni. However the atomic number of (Co = 27) is less than that of Ni (28) Therefore, they have been correctly arranged in the modern periodic table.
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