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Home / Doubts and Solutions/CBSE/Class 10/Chemistry

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

Asked by Topperlearning User 24th July 2017, 4:21 PM
Answered by Expert
Answer:

Mendeleev's Periodic Table was based on the law that the properties of elements are the periodic function of their atomic masses. So, cobalt with atomic mass 58.93 should be placed after nickel with atomic mass 58.71. But to maintain similarity in properties, it had to be placed before nickel in Mendeleev's Periodic Table. 

Modern Periodic Table is based on the law that the properties of elements are the periodic function of their atomic numbers. So, the problem was resolved because cobalt has lower atomic number (27) than that of nickel (28). 

Answered by Expert 24th July 2017, 6:21 PM
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