-
Engineering and Architecture
Exams
Colleges
Predictors
Resources
-
Computer Application and IT
Quick Links
Colleges
-
Pharmacy
Colleges
Resources
-
Hospitality and Tourism
Colleges
Resources
Diploma Colleges
-
Competition
Other Exams
Resources
-
School
Exams
Top Schools
Products & Resources
-
Study Abroad
Top Countries
Resources
-
Arts, Commerce & Sciences
Colleges
Upcoming Events
Resources
-
Management and Business Administration
Exams
Colleges & Courses
Predictors
-
Learn
Law Preparation
MBA Preparation
Engineering Preparation
Medical Preparation
-
Online Courses and Certifications
Top Streams
Specializations
- Digital Marketing Certification Courses
- Cyber Security Certification Courses
- Artificial Intelligence Certification Courses
- Business Analytics Certification Courses
- Data Science Certification Courses
- Cloud Computing Certification Courses
- Machine Learning Certification Courses
- View All Certification Courses
Resources
-
Medicine and Allied Sciences
Colleges
Predictors
Resources
-
Law
Resources
Colleges
-
Animation and Design
Exams
Predictors & Articles
Colleges
Resources
-
Media, Mass Communication and Journalism
Colleges
Resources
-
Finance & Accounts
Top Courses & Careers
Colleges
Stability of Completely filled and Half-filled Subshells - (Concept)
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.
| Exam | Chapter |
| JEE MAIN | Atomic Structure |
Which of the following configuration is correct in first excited state for?
| A. |
|
| B. |
|
| C. |
|
| D. |
|
In Cu (atomic number = 29)
| A. |
|
| B. |
|
| C. |
|
| D. |
|
Chromium has the electronic configuration rather than
because
| A. |
|
| B. |
|
| C. |
|
| D. |
|
Correct valence shell electronic configuration of the given element is correctly represented in
| A. |
|
| B. |
|
| C. |
|
| D. |
|
In Cu (atomic number = 29):
| A. |
|
| B. |
|
| C. |
|
| D. |
|
Which one of the following is the wrong statement?
| A. |
|
| B. |
|
| C. |
|
| D. |
|
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:
| A. |
|
| B. |
|
| C. |
|
| D. |
|
Total number of isomeric compounds (including stereoisomers) formed by monochlorination of 2-methylbutane is ____________ .
| A. |
|
| B. |
|
| C. |
|
| D. |
|
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?
| A. |
|
| B. |
|
| C. |
|
| D. |
|
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
| A. |
|
| B. |
|
| C. |
|
| D. |
|
The ground state electronic configuration of the atom of an element always corresponds to the state of the lowest total electronic energy.
-
- Atomic Models
- Developments leading to the Bohr’s model of atom
- Particle Nature of electromagnetic radiation
- Photoelectric Effect
- Line Spectrum of hydrogen
- Bohr model for hydrogen atom
- Dual behavior of matter
- Heisenberg’s uncertainty principle
- Elementary ideas of quantum mechanics
- Quantum mechanical model of atom
- Quantum Numbers (Concept)
- Shape of Orbitals (Concept)
- Radial nodes and planar nodes (Concept)
- Aufbau Principle, Pauli Exclusion Principle and Hund's Rule of Maximum Multiplicity (Concept)
- Electronic configuration of any element (Concept)
- Stability of Completely filled and Half-filled Subshells (Concept)
