JCECE Engineering JCECE Engineering Solved Paper-2002

  • question_answer The electronic configuration of\[F{{e}_{26}}\]is\[[Ar]\]:

    A) \[3{{d}^{8}}4{{s}^{2}}\]                

    B) \[3{{d}^{7}}4{{s}^{2}}\]

    C)  \[3{{d}^{6}}4{{s}^{2}}\]               

    D)  \[3{{d}^{5}}4{{s}^{2}}\]

    Correct Answer: C

    Solution :

    Key Idea: Electrons are filled in orbitals according to aufbau rule. \[_{26}Fe=1{{s}^{2}},\,\,2{{s}^{2}},\,\,2{{p}^{6}},\,\,3{{s}^{2}},\,\,3{{p}^{6}},\,\,4{{s}^{2}},\,\,3{{d}^{6}}\]

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