# Atomic energy levels Silicon

• Matt atkinson
In summary, the ##3p4p## configuration has more L, S, J levels than the ##3p^2## configuration due to the fact that the two electrons in the excited level can have different quantum numbers, while in the ground state they are restricted by the Pauli principle. This results in a greater number of possible combinations and therefore more levels in the excited state.
Matt atkinson

## Homework Statement

Silicon has the configuration [Mg] ##3p^2##.
Explain why there are more L, S, J levels for the ##3p4p## configuration
than in the ##3p^2## configuration.

## The Attempt at a Solution

My thought is because in the ##3p^2## subshell you have less variations of ##M_l## and ##M_s## because both electrons cannot have the same quantum numbers, wheres with the ##3p4p## level, they could both have ##M_l=+1## and ##M_s=+1## because the ##n## the principle quantum number is different?

Last edited:
Matt atkinson said:
My thought is because in the ##3p^2## subshell you have less variations of ##M_l## and ##M_s## because both electrons cannot have the same quantum numbers, wheres with the ##3p4p## level, they could both have ##M_l=+1## and ##M_s=+1## because the ##n## the principle quantum number is different?
You're on the right track. But there are more states than just the one you cited (##M_l=+1## and ##M_s=+1##).

Yes, i understand that there would twice (?) as many states in the excited level because the electrons would be free to have any ##m_l## or ##m_s##, but the states for the ##3p^2## level are restricted by the Pauli principle.

Matt atkinson said:
Yes, i understand that there would twice (?) as many states in the excited level because the electrons would be free to have any ##m_l## or ##m_s##, but the states for the ##3p^2## level are restricted by the Pauli principle.
Not twice, because it is only the states where the two electrons have the same spin in the same orbital that have to be discarted. But I think you get the idea.

Ah okay thankyou!

## 1. What are the energy levels of silicon atoms?

The energy levels of silicon atoms refer to the different states of energy that an electron can occupy in the silicon atom. These energy levels are quantized, meaning that only certain energy values are allowed for the electron to occupy.

## 2. How many energy levels does a silicon atom have?

A silicon atom has a total of four energy levels. These levels are labeled as K, L, M, and N, with K being the closest to the nucleus and N being the farthest.

## 3. How are the energy levels of silicon atoms determined?

The energy levels of silicon atoms are determined by the number of protons and neutrons in the nucleus, as well as the number of electrons in the atom. The number of energy levels is equal to the number of electron shells in the atom, which is determined by the atomic number of silicon (14).

## 4. What is the significance of the energy levels in silicon atoms?

The energy levels in silicon atoms play a crucial role in determining the chemical and physical properties of silicon. They also dictate the behavior of electrons in the atom, which is important for understanding how silicon can be used in various electronic devices.

## 5. Can the energy levels of silicon atoms be changed?

Yes, the energy levels of silicon atoms can be changed through the absorption or release of energy. This can occur through various processes, such as electron excitation or ionization. Additionally, the energy levels can also be altered through external influences, such as electric and magnetic fields.

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