Question

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In Mendeléev's Periodic Table the elements were arranged in the increasing order of their atomic masses. However, cobalt with atomic mass of 58.93 amu was placed before nickel having an atomic mass of 58.71 amu. Give reason for the same.
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Answer 1

Answer:

To satisfy the chemical property trend in elements.

Explanation:

In Mendeleev's periodic table elements are arranged in increasing order of their masses, and also follow a trend in chemical properties after placing elements in increasing order of their masses.