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JEE Main 2026 Preparation: Question Papers, Solutions, Mock Tests & Strategy Unacademy » JEE Study Material » Physics » Degenerate Orbitals

Degenerate Orbitals

These are the degenerate orbitals, and we will learn more about them in this article.

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Degenerate Orbitals are orbitals that have the same levels of energy as one another. They are related with a number of different concepts, including the Aufbau Principle, Hund’s rule, and Pauli’s Principle, all of which help us comprehend the fundamental method in which electrons are distributed throughout the various orbitals.

Degenerate Orbitals are electron orbitals that have the same energy levels as the electrons in them. It is not possible for the electrons in the orbitals to be altered by external influences such as an electric or magnetic field. This is due to the degeneracy of these orbitals, which interferes with the application of the magnetic field.

Degenerate orbitals: A brief description

Degenerate orbitals are electron orbitals that have the same energy levels as their neighbouring electron orbitals. According to the Ababa principle, lesser energy levels are squeezed into smaller spaces before greater energy levels. According to Hund’s rule, degenerate orbitals are jammed into the same amount of space as electrons before they are crammed into higher energy levels. The Aufbau principle, Pauli’s law of nature, and Hund’s rule are the three principles that govern the way in which electrons are dispersed into orbitals within a certain space of time. Pauli’s law of nature is the most well-known of the three rules.

An atom has four orbitals, which are denoted by the letters s, p, d, and f. All of the p orbitals, px, py, and pz, have the same amount of energy as the p-orbital itself. As a result, they are referred to as degenerate orbitals. Every orbital initially consists of one electron, with the second electron having to have the opposite spin as the first electron. At the end of the day, there are six electrons, each of which has three orbitals. As a result, the p-orbital is completely filled.

As stated by Friedrich Hund, Hund’s law of Multiplicity states that electrons are responsible for filling the Degenerate Orbitals with electrons.

The degenerate orbitals in a subshell are filled with one electron before any other orbital is filled with two electrons.

It is always necessary to add electrons to a subshell that has the same value of the quantum spin number in order for each orbital in that subshell to contain at least one electron.

Generally, Hund’s rule of multiplicity states that, in a given electronic configuration, electron pairing can only take place in the p, d, and f orbitals if each electron in a subshell has one electron each. Assume that the electrical configuration of a carbon atom is 1s22s22p2. This is the case. As a result, according to Hund’s rule, the orbital will be occupied by two 2s electrons, while the other orbitals will be filled with two electrons (2p) in each.

Examples of degenerate orbitals

There are three degenerate orbitals in the P orbital. All three of them have the same amount of energy. Every orbital is initially assigned only one electron, which is the most common configuration. The second electron has the opposite spin as the first. Every orbital is crammed, and there are a total of six electrons in the system.

Degenerate Orbitals and Their Explanation

All of the orbitals within the 2p sublevel are degenerate orbitals – this means that the energies of all of the orbitals within this sublevel are exactly the same – as seen in the diagram supplied below. The 3px, 3py, and 3pz orbitals are all degenerate orbitals, as well. At the 3d energy, the 3dxy, 3dxz, 3dyz, 3dx2 – y2, and 3dz2 are degenerate orbitals with same energy, as are the  3dx2 – y2and 3dz2at the 3d energy.

Degeneracy

Degeneracy is the term used to describe the entire spectrum of different states with the same energy. It is also referred to as the degree of degeneracy in some circles.

There are three degrees of degeneracy in the p orbitals.

There are five degrees of degeneracy in the d orbitals.

The degree of degeneracy of f orbitals is seven in number of degrees.

Degenerated subshell

Taking the 2p sublevel as an example, degenerate orbitals exist – that is, the 2px, 2py, and 2pz orbitals have the same amount of energy as each other, as indicated in the diagram.

A higher energy than 2p causes degeneracy in the three-pointed x, three-pointed y, and three-pointed z orbitals.

In addition, at a higher energy level, the 3dxy, 3dxz, 3dyz, 3dx2 – y2, and 3dz2are degenerate states of matter.

The degree of degeneracy, or simply degeneracy, is the number of distinct states of equal energy that can exist at the same time.

It is known that the degeneracy of p orbitals is three; the degeneracy of d orbitals is five; and the degeneracy of f orbitals is seven.

Conclusion

Degenerate orbitals are orbitals in the same subshell that have the same energy as each other. Because they are not influenced by external elements such as an electric field or a magnetic field, the electrons in the orbitals have the same energies when they are not in contact with one another.

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Frequently asked questions

Get answers to the most common queries related to the IIT JEE Examination Preparation.

What are the characteristics of an orbital degenerate?

Ans. Degenerate orbitals are electron orbitals that have the same energy levels as their neighbouring electron orbit...Read full

Is there a way to tell if an orbital is degenerate?

Ans. Degenerate orbitals are orbitals with the same energy as their parent orbital. A maximum of two electrons can b...Read full

Why are degenerate orbitals initially only occupied by a single atom?

Ans. According to Hund’s first rule, a set of degenerate orbitals must b...Read full

Ans. Degenerate orbitals are electron orbitals that have the same energy levels as their neighbouring electron orbitals. According to the Aufbau principle, lower energy levels are filled first, and then higher energy levels are filled. According to Hund’s rule, electrons are filled uniformly into degenerate orbitals before they are filled evenly into higher energy levels.

Ans. Degenerate orbitals are orbitals with the same energy as their parent orbital. A maximum of two electrons can be found in each atomic orbital. Because there are only s atomic orbitals in the first shell, there are only two electrons in it. The second shell may accommodate a total of eight electrons for one s and three p atomic orbitals in one s and three p atomic orbitals in the second shell.

Ans. According to Hund’s first rule, a set of degenerate orbitals must be single-handedly occupied before the second slot in any of the orbitals can be filled. As a matter of fact, if the electrons begin to fill two orbitals in a single orbital at the same time, the atom will become more unstable due to electron-electron repulsions, which would make the atom more unstable.

 

 

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