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JEE Main & Advanced Chemistry Classification of Elements and Periodicity in Properties / तत्त्वों का वर्गीकरण एवं गुणों में आवर्ति Question Bank Numerical Value Type Questions - Classification of Elements and Periodicity in Properties

  • question_answer
    An element 'X' has its electronic configuration of 'K' shell \[(n-5){{s}^{2}}\]and the total number of electrons in its outer-most, penultimate and antepenultimate shell are 2, 8 and 25 respectively, then find out the total number of unpaired electrons in element 'X' in its ground state.

    Answer:

    7


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