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  5. Structure of Atom / परमाणु संरचना

JEE Main & Advanced Chemistry Structure of Atom / परमाणु संरचना Sample Paper Topic Test - Structure of Atom

  • question_answer
    Number of electrons having \[\ell +m\] value equal to zero in \[_{26}Fe\] may be

    A) 13 

    B) 20

    C) 7

    D) 12

    Correct Answer: A

    Solution :

    [a] \[_{26}Fe-1{{s}^{2}},2{{s}^{2}}2{{p}^{6}},3{{s}^{2}}3{{p}^{6}},3{{d}^{6}},4{{s}^{2}}\]
    \[\ell +m=0\] \[\Rightarrow \] \[\ell =0,\,m=0\] i.e. s-subshell
    \[\ell =1,\,\,m=-1\] i.e. one orbital of p.
    \[\ell =2,\,\,m=2\] i.e. one of d-orbital's
    Hence there are 13 of 14 electrons as in d-orbital it may be one or two electron having \[m=-2\]


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