J & K CET Engineering J and K - CET Engineering Solved Paper-2009

  • question_answer Which one of the following is \['d'-\]block element?                

    A)  Gd            

    B)  Hs

    C)  Es             

    D)  Cs

    Correct Answer: B

    Solution :

     The element in which last electron enters in d-orbital is called d-block element. The electronic configuration of the given elements are as follows \[Gd(64)=[Xe]6{{s}^{2}},4{{f}^{7}},5{{d}^{1}}\] \[Hs(108)=[Rn]7{{s}^{2}},5{{f}^{14}},6{{d}^{6}}\]\[Es(99)=[Rn]7{{s}^{2}},5{{f}^{11}}\] \[Cs(55)=[Xe]\,6{{s}^{1}}\] Thus, Hs is a d-block element

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