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WB JEE Medical WB JEE Medical Solved Paper-2014

  • question_answer
    \[({{\,}_{32}}G{{e}^{76}}{{,}_{34}}S{{e}^{76}})\]and \[({{\,}_{14}}S{{i}^{30}}{{,}_{16}}{{S}^{32}})\] are examples of

    A)  isotopes and isobars

    B)  isobars and isotones

    C)  isotones and isotopes

    D)  isobars and isotopes

    Correct Answer: B

    Solution :

     \[{{\,}_{32}}G{{e}^{76}}\]and \[{{\,}_{34}}S{{e}^{76}}\] have the same mass number but different atomic number, so they are isobars. Number of neutrons, in         \[{{\,}_{14}}S{{i}^{30}}=30-14=16\] in        \[{{\,}_{16}}S{{i}^{32}}=32-16=16\] Because of the presence of same number of neutrons, \[{{\,}_{14}}S{{i}^{30}}\]and \[{{\,}_{16}}S{{i}^{32}}\]are called isotones.


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