Question

How is the problems regarding the position
of cobalt (59co) and Nickel(59NI) in merdeleev's
periodic table resolved in the the modern
periodic table ?​

Answer 1

Answer:

Cobalt has an atomic mass of 58.9 and nickel has an atomic mass of 58.7, which is slightly lower than that of cobalt. Mendeleev could not explain this point. This problem was resolved in the modern periodic table. So, cobalt with a lower atomic number should come before nickel.

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Answer 2

Answer:

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Explanation:

• because modern periodic table is based on atomic number not on atomic mass. this is why both the isotopes of CL has same atomic number that is 17 hence it has fixed position in modern periodic table....