Answer:
In Mendeleev's periodic
table, cobalt (Co) with a higher atomic mass of 58.93 u is placed before nickel
(Ni) due to the following reasons
(i) The properties
of cobalt are similar to those of rhodium (Rh) and iridium (Ir) (same group)
and
(ii) The
properties of nickel are similar to those of palladium (Pd) and platinum (Pt)
(same group),
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