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JCECE Engineering JCECE Engineering Solved Paper-2002

  • question_answer
    The element with electronic configuration \[1{{s}^{2}}2{{s}^{2}}2{{p}^{6}},\,\,3{{s}^{2}}3{{p}^{6}},\,\,4{{s}^{2}}\] shows same property as:

    A) \[Mo\]                                 

    B) \[Rb\]

    C)  \[Ca\]                                  

    D)  \[Sr\]

    Correct Answer: D

    Solution :

    Key Idea: The block and group of element is decided by its electronic configuration. Elements belonging to same group have same configuration and same properties. Given\[1{{s}^{2}},\,\,2{{s}^{2}},\,\,2{{p}^{6}},\,\,3{{s}^{2}},\,\,3{{p}^{6}},\,\,4{{s}^{2}}\]is                 configuration of element \[\therefore \]Atomic number of element is\[=20\] \[\therefore \]It is\[Ca\].                 \[Ca\] and \[Sr\] belong to same group. \[\therefore \]  \[Ca\] and \[Sr\] show same properties.


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