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Stability Of Orbitals: Half-Filled And Completely-Filled - Practice Questions & MCQ
Edited By admin | Updated on Sep 18, 2023 18:34 AM | #JEE Main
Quick Facts
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9 Questions around this concept.
Solve by difficulty
Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R).
Assertion (A): In aqueous solutions $\mathrm{Cr}^{2+}$ is reducing while $\mathrm{Mn}^{3+}$ is oxidizing in nature. Reason (R): Extra stability to half filled electronic configuration is observed than incompletely filled electronic configuration.
In the light of the above statements, choose the most appropriate answer from the options given below:
Which of the following is the correct plot for the probability density $\Psi^2(\mathrm{r})$ as a function of distance 'r' of the electron from the nucleus for 2s orbital?
The extra stability of half-filled subshell is due to
(A) Symmetrical distribution of electrons
(B) Smaller coulombic repulsion energy
(C) The presence of electrons with the same spin in non-degenerate orbitals
(D) Larger exchange energy
(E) Relatively smaller shielding of electrons by one another
Identify the correct statements
Concepts Covered - 1
Stability of Completely filled and Half-filled Subshells
Stability of completely filled and half-filled subshells
The completely filled or half-filled subshells have the symmetrical distribution of electrons in them and are therefore more stable.
1.Symmetrical distribution of electrons: 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.
2. Exchange Energy: The stabilizing effect arises whenever two or more electrons with the same spin are present in the degenerate orbitals of a subshell. These electrons tend to exchange their positions and the energy released due to this exchange is called exchange energy. The number of exchanges that can take place is maximum when the subshell is either half filled or completely filled. As a result, the exchange energy is maximum and so is the stability.
For eg: The valence electronic configurations of Cr and Cu are 3d54s1 and 3d104s1 respectively and not 3d44s2 and 3d94s2.
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