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Which of the following configuration is correct in first excited state for?

Option: 1

Cr: [Ar] 3d5 4s1


Option: 2

Mn2+: [Ar] 3d5  


Option: 3

Fe2+: [Ar] 3d5 4s1 


Option: 4

Co3+: [Ar] 3d5  


Answers (1)

best_answer

 

Stability of Completely filled and Half-filled Subshells -

Stability of completely filled and half-filled subshells 

It is well known that symmetry leads to stability. The completely filled or half-filled subshells have the symmetrical distribution of electrons in them and are therefore more stable.

For eg: the valence electronic configurations of Cr and Cu, therefore, are 3d54s1 and 3d104s1 respectively and not 3d44s2 and 3d94s2.

-

 

As we learnt,

Stability of Half Filled Subshells of Cr -

The valence electronic configurations  of Cr  is 3d5 4s1 and not 3d4 4s2

-

Cr: [Ar] 3d5 4s1     ground state

Mn2+: [Ar] 3d5      ground state

Fe2+: [Ar] 3d6     ground state

          [Ar] 3d5 4s1    excited state      

Co3+: [Ar] 3d5    ground state

Therefore, Option(3) is correct

Posted by

Gaurav

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