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JEE Main & Advanced Chemistry Structure of Atom / परमाणु संरचना Question Bank Topic Test - Structure of Atom (4-5-21)

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

    A) 17

    B) 37

    C) 2

    D) 38

    Correct Answer: D

    Solution :

    [d] No. of proton and no. of electron = 18\[[Ar_{18}^{36}]\] and No. of neutron = 20             Mass number = P + N  = \[18+20=38.\]


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