Chemistry
How are the positions of Cobalt and Nickel resolved in the Modern periodic table?
Periodic Table
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Answer
In Mendeleev's periodic table, Cobalt with atomic mass 58.9 preceded Nickel with atomic mass 58.6. This anomaly was resolved in Modern periodic table by arranging the elements based on their atomic number instead of atomic mass.
Cobalt with atomic number 27 is placed in group 9 and Nickel with atomic number 28 is placed in group 10 in the Modern periodic table.
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