how is the problem regarding the position of cobalt and nickel in mendeleevs periodic table resolved in modern periodic table??
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According to modern periodic law, elements are arranged in the order of increasing atomic numbers. The atomic number of cobalt is 27 and that of nickel is 28. ... In this way, the positions of cobalt and nickel were resolved in the modern periodic table....
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(i) Gold and Platinum occur in free state.
(ii) They are noble metals, hence they are least reactive.
(iii) They are not affected by air, water and other
natural factors.
(iv) Hence, pure gold and platinum always glitter.
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