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

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    An element have atomic weight 40 and it?s electronic configuration is \[1{{s}^{2}}2{{s}^{2}}2{{p}^{6}}3{{s}^{2}}3{{p}^{6}}.\] Then its atomic number and number of neutrons will be               [RPMT 2002]

    A)                 18 and 22            

    B)                 22 and 18

    C)                 26 and 20            

    D)                 40 and 18

    Correct Answer: A

    Solution :

               \[Ar_{18}^{40}\] = atomic number 18 and no. of Neutron in case of \[A{{r}_{22}}\]                    Neutron = Atomic mass ? Atomic number                                \[=40-18=22\]


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