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  • In Mendeleev ’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.

In Mendeleev ’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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In Mendeleev ’s Periodic Table the elements were arranged in the increasing order of their atomic masses. But cobalt with atomic mass of 58.93 amu was placed before nickel having an atomic mass of 58.71 amu because
a)The properties of cobalt are similar to rhodium and iridium
b)The properties of nickel are similar to palladium and platinum
And in order to have the elements with similar properties under one group cobalt is placed before nickel even if its mass is greater than that of nickel.

 

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