JEE Main & Advanced Chemistry Structure of Atom Question Bank Quantum number, Electronic configuration and Shape of orbitals

  • question_answer The number of unpaired electrons in a chromic ion \[C{{r}^{3+}}\]  (atomic number = 24) is          [MNR 1986; CPMT 1992]

    A)                 6             

    B)                 4

    C)                 3             

    D)                 1

    Correct Answer: C

    Solution :

                    \[C{{r}_{24}}=(Ar)\,3{{d}^{5}}\,4{{s}^{1}}\] but \[Cr_{24}^{3+}=(Ar)\,3{{d}^{3}}\,4{{s}^{0}}\]


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