In Mendeleev's Periodic Table,the elements we | vedclass

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(B) Mendeleev's primary criterion for arranging elements was to group elements with similar chemical properties together in the same column or group.E

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Elements with similar properties were grouped together.

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(B) Mendeleev's primary criterion for arranging elements was to group elements with similar chemical properties together in the same column or group.Even though cobalt $(58.93 \ amu)$ has a higher atomic mass than nickel $(58.71 \ amu)$,Mendeleev placed cobalt before nickel because cobalt shows chemical properties similar to rhodium and iridium,while nickel shows properties similar to palladium and platinum.Therefore,to maintain the periodicity of properties,he prioritized chemical similarity over the strict increasing order of atomic masses.

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

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