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EAMCET Medical EAMCET Medical Solved Paper-2005

  • question_answer
    Observe the following statements regarding isotones: (i) 39 K and 40 Ca are isotones. (ii) Nucleides having different atomic (Z) and mass numbers but same number of neutrons \[(n)\] are called isotones. (iii) \[{{\,}^{19}}F\] and \[{{\,}^{23}}Na\] are isotones. The correct answer is

    A)  1, 2 and 3 are correct

    B)  Only 1 and 2 are correct

    C)  Only 1 and 3 are correct

    D)  Only 2 and 3 are correct

    Correct Answer: B

    Solution :

                     Neutrons in \[{{\,}_{19}}{{K}^{39}}=39-19=20\] Neutrons in \[{{\,}_{20}}C{{a}^{40}}=40-20=20\] Hence, these nuclei are isotones.


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