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  • Please,please help me - d and f Block Elements - NEET-2

Which one of the following ions has electronic configuration \left [ Ar \right ]3d^{6}?
(At Nos. Mn=25, Fe=26, Co=27, Ni=28)

  • Option 1)

    Ni^{3+}

  • Option 2)

    Mn^{3+}

  • Option 3)

    Fe^{3+}

  • Option 4)

    CO^{3+}

 

Answers (1)

best_answer

As we learned in concept

Exceptional configuration in '3d' series -

Due to half fill stable configuration 24^{Cr} is stable in 3d^{5}\:4s^1 configuration at the place of 3d^{4}\:4s^2.
Similarly, 29^{Cu} stable with 3d^{10}4s^1 at the place of 3d^{9}4s^2.

-

 

 Electronic config of Ni^{3+}=[Ar]3d^{7}4s^{\circ}

 Electronic config of Mn^{3+}=[Ar]3d^{4}4s^{\circ}

 Electronic config of Fe^{3+}=[Ar]3d^{3}4s^{\circ}

 Electronic config of Co^{3+}=[Ar]3d^{6}4s^{\circ}


Option 1)

Ni^{3+}

This option is incorrect.

Option 2)

Mn^{3+}

This option is incorrect.

Option 3)

Fe^{3+}

This option is incorrect.

Option 4)

CO^{3+}

This option is correct.

Posted by

divya.saini

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