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JEE Main & Advanced Chemistry Structure of Atom / परमाणु संरचना Question Bank Atomic number, Mass number Atomic species

  • question_answer
    The number of electrons and neutrons of an element is 18 and 20 respectively. Its mass number is [CPMT 1997; Pb. PMT 1999; MP PMT 1999]

    A)                 17          

    B)                 37

    C)                 2             

    D)                 38

    Correct Answer: D

    Solution :

               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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