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

  • question_answer
    An atom has the electronic configuration of \[1{{s}^{2}},2{{s}^{2}}2{{p}^{6}}\], \[3{{s}^{2}}3{{p}^{6}}3{{d}^{10}},4{{s}^{2}}4{{p}^{5}}\]. Its atomic weight is 80. Its atomic number and the number of neutrons in its nucleus shall be [MP PMT 1987]

    A)                 35 and 45            

    B)                 45 and 35

    C)                 40 and 40            

    D)                 30 and 50

    Correct Answer: A

    Solution :

               \[_{35}B{{r}^{80}}\,=\,\,1{{s}^{2}}\,2{{s}^{2}}\,2{{p}^{6}}3{{s}^{2}}3{{p}^{6}}3{{d}^{10}}4{{s}^{2}}4{{p}^{5}}\]       \[A=\,80\], \[Z=\,35\], \[N=\,?\]            \[N=A-Z=80-35=45\]                          atomic number (Proton) is 35 and no. of neutron is 45.


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