The electronic configurations of Cr^{24} and | vedclass

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Question

(A) Expected electronic configuration:$24 \ Cr : [Ar] 3d^4 4s^2$$29 \ Cu : [Ar] 3d^9 4s^2$Observed electronic configuration:$24 \ Cr : [Ar] 3d^5 4s^1$

Vedclass · Accepted Answer

Due to extra stability of exactly half-filled and exactly fully-filled subshells.

Vedclass · Answer

(A) Expected electronic configuration:$24 \ Cr : [Ar] 3d^4 4s^2$$29 \ Cu : [Ar] 3d^9 4s^2$Observed electronic configuration:$24 \ Cr : [Ar] 3d^5 4s^1$$29 \ Cu : [Ar] 3d^{10} 4s^1$Due to the extra stability of half-filled and fully-filled subshells,one electron from the $4s$ orbital jumps to the $3d$ orbital. Therefore,chromium and copper show abnormal electronic configurations.

The electronic configurations of $Cr^{24}$ and $Cu^{29}$ are abnormal.

Similar Questions

The principal quantum number of an atom is related to the:

The two electrons $X$ and $Y$ have the following sets of quantum numbers:
$X: n=3, l=2, m=-2, s=+1/2$ $Y: n=3, l=0, m=0, s=+1/2$

Which of the following is the correct statement?

The allowed set of quantum numbers for an electron in a hydrogen atom is

Which of the following orbitals has the same value of $(n+l)$ as that of the $3d$ orbital?

Which two factors affect the energy of an electron in an orbit? How?

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