Though the atomic mass of cobalt (58.9) is greater than nickel (58.7) yet Co is placed
before Ni in Mendleev's periodic table. Why.
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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. Answer. ... (i) Cobalt was placed in the group of rhodium (Rh) and iridium (Ir) because it exhibits the properties similar to them.
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