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J & K CET Medical J & K - CET Medical Solved Paper-2001

  • question_answer
    \[_{19}^{39}K\]and\[_{20}^{40}Ca\]are:

    A)  isomers                              

    B)  isobars

    C)  isotones                             

    D)  isotopes

    Correct Answer: C

    Solution :

                    Isotones have same number of neutrons.\[_{19}^{39}K\] and\[_{20}^{40}Ca\]are isotones. They have 20 neutrons in each. \[_{19}^{39}K:\,\,\,\,\,\,e=p=19,\,\,\,\,\,\,n=39-19=20\] \[_{20}^{40}Ca:\,\,\,\,\,\,e=p=20,\,\,\,\,\,\,n=40-20=20\]


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