How were the positions of cobalt and nickel resolved in the modern per – InterviewSolution

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1.	How were the positions of cobalt and nickel resolved in the modern periodic table ?
Answer» Solution :( 1 ) In modern periodic table, elements are arranged in increasing ORDER of their atomic numbers. (2) The atomic NUMBER of cobalt and nickel are 27 and 28 RESPECTIVELY. Hence, on the basis of increasing order of their atomic numbers, cobalt is placed in group 9 and nickel is placed in group 10.

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