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InterviewSolution
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How is the problem regarding the position of cobalt (""^59Co) and nickel (""^59Ni) in Mendeleev's periodic table resolved in Modern Periodic table? |
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Answer» Solution :(i) ACCORDING to Mendeleev.s periodic law, ELEMENTS are arranged in the order of their increasing ATOMIC masses. (ii) When Co. and Ni were put in the group on the basis of their chemical properties it was found that Co having HIGHER mass of 58.9 comes first and Nickel with slightly lower atomic mass of 58.7 comes later. (III) Modem Periodic table resolved this problem. According to the Modem Periodic law, elementsare arranged in their increasing order of atomicnumber. (iv) The atomic number of Cobalt is 27 comes first andNickel with atomic number 28 comes next even if their atomic masses are in the reverse order. |
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