JEE Main & Advanced Chemistry Classification of Elements and Periodicity in Properties Question Bank Valency and oxidation state

  • question_answer In the ground state of cobalt atom (Z = 27) there are ....... unpaired electrons and thus the atom is.......

    A) 2, diamagnetic

    B) 2, paramagnetic

    C) 3, diamagnetic

    D) 3, paramagnetic

    Correct Answer: D

    Solution :

    \[Co-[Ar]3{{d}^{7}}4{{s}^{2}}\], it has 3 unpaired \[{{e}^{-}}\]so it is a paramagnetic.

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