# Does the intrinsic spin of electrons change when we excite electrons for hybridisation?

Have had been told that electrons can move from one energy level to another by transmitting or taking in energy, and do that profitably in hybridisation. I am interested in knowing how exactly do they "jump" from one level to another. Do the electrons move as a particle or as a wave through energy levels (because if they move as a particle, the distance and space between the electron shells must be covered) because electrons exhibit wave-particle duality?

Also, I want to to know isn't Hund's Rule of Maximum Multiplicity broken when an electron in Carbon's $$2s$$ orbital Jumps to $$2p$$ orbital to form a hybridised $$sp^3$$ for say methane formation. I am in the dilemma as to whether the original $$2s$$ electron jumps and reverses its spin or the Hund's rule is just a Rule not a law.

• Welcome to Physics.SE! You should make a two separate questions instead of asking two questions in the same post. It helps with organization. – JoshuaTS Dec 4 '20 at 4:59
• Its actually just one question. I shouldn't have had written "Also" – Vishal Dec 9 '20 at 11:29
• @JoshuaTS Is correct (you need to @ usernames for it to notify them of your comment by the way), you have two questions here. One is about how energy levels work and the other is about Hund's rule. – Richard Myers Feb 23 at 23:34

No the spin of the electron does not change. When we excite electrons it just changes the shell or subshell but never the spin because spin is a magnetic character and when we excite the electron then we just give it energy to change shell and when it becomes excited it emits radiation to become more stable but in whole process the spin remains same.

Does the intrinsic spin of electrons change when we excite electrons for hybridisation?

In physics, intrinsic spin is the intrinsic angular momentum = to 1/2 that characterizes the electron, and means it is invariant.

If you mean the projection of the spin, (which can be + or -1/2) , it depends on the particular interaction's angular momenta; in your case the angular momentum characterizing the energy level, the projection of the spin of the electron can change. It is angular momentum that has to be conserved.

I am interested in knowing how exactly do they "jump" from one level to another.

The electrons in energy levels of atoms or molecules are in orbitals, not orbits, i.e. probability loci. To get a feeling for orbitals see this calculation for the hydrogen atom. To change energy levels energy has to be supplied , a photon with the energy difference from level to level, and the photon spin will also be involved in the probability of the given transition. This could be a virtual photon, and one has to study quantum mechanics to understand virtual photons (see the second page in this link).

In general it is quantum mechanical probabilities that control transitions in atoms and molecules.

Do the electrons move as a particle or as a wave through energy levels (because if they move as a particle, the distance and space between the electron shells must be covered) because electrons exhibit wave-particle duality?

The "wave" in wave particle duality is a probability wave, how probable it is to find the electron when measured at (x,y,z,t). One is in the realm of quantum mechanics, not classical physics with orbits.