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  3. WB JEE Medical

WB JEE Medical WB JEE Medical Solved Paper-2007

  • question_answer
    . The number of electrons and neutrons of an element is 18 and 20 respectively. Its mass number is

    A)  2                                            

    B)  17

    C)  37                                         

    D)  38

    Correct Answer: D

    Solution :

                     The mass number = atomic number + number of neutron Atomic number = no. of proton = no. of electron (for an atom) So, mass number = 18 + 20 = 38


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