Cobalt has an atomic number 27 and nickel 28. According to the modern periodic law elements are arranged in the order of increasing atomic number. So
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Cobalt is placed before Nickel even through their atomic masses are not in increasing order...
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Explanation:
(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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