s block elements, Chemistry

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Which set of quantum numbers are not possible from the following: (1) n=3, l= 2, m=0, s= -1/2                 (2) n=3, l= 2, m=-2 s= -1/2            (3) n=3, l= 3, m=-3,

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The number of quantum numbers required to describe an electron in an atom completely is: (1) 1          (2) 2         (3) 3     (4) 4 Ans: 4

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how can the melting point be used to determine the purity of organic compounds

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