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CMC Medical CMC-Medical VELLORE Solved Paper-2009

  • question_answer
    Element with atomic number 81, is present in which block?

    A)  s-block                

    B)  p-block

    C)  d-block               

    D)  f-block

    Correct Answer: B

    Solution :

                    The electronic configuration of the atom with atomic number 81 is \[=[Xe]\,4{{f}^{14}},5{{d}^{10}},6{{s}^{2}}{{p}^{1}}\] Electronic configuration shows that p orbitals of the element are incomplete, hence it belongs to p block (III A group element, ie, TI).


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