## Electrons in an Orbital [ENDORSED]

nicolesalcedo
Posts: 30
Joined: Fri Apr 06, 2018 11:05 am

### Electrons in an Orbital

Hi, I wasn't able to come to lecture on Friday, so I'm unsure about the number of electrons in a orbital. I've seen models where there are up to 8 electrons in an orbital, is the maximum really just two?

JoeyAnn Mateo 1D
Posts: 30
Joined: Fri Apr 06, 2018 11:04 am

### Re: Electrons in an Orbital  [ENDORSED]

An orbital can only contain up to 2 electrons. This is Pauli's exclusion principle.

nicolesalcedo
Posts: 30
Joined: Fri Apr 06, 2018 11:05 am

### Re: Electrons in an Orbital

And just to confirm, those two electrons need to have opposite spins, otherwise they cannot be together?

JoeyAnn Mateo 1D
Posts: 30
Joined: Fri Apr 06, 2018 11:04 am

### Re: Electrons in an Orbital

Yes, when two electrons are in the same orbital they must have opposite spins. The short term for these electrons is that they are "paired".

nicolesalcedo
Posts: 30
Joined: Fri Apr 06, 2018 11:05 am

### Re: Electrons in an Orbital

For instance, in the carbon example that Lavelle gave us in class, why are the two electrons in two different orbitals even though they are in the same subshell? Is it just because they have the same spin?

JoeyAnn Mateo 1D
Posts: 30
Joined: Fri Apr 06, 2018 11:04 am

### Re: Electrons in an Orbital

According to Hund's rule, electrons repulse each other because they are the same charge, and while in the same subshell, they must occupy different orbitals. This means that there are two electrons in the 2p subshell and must first fill two orbitals and have parallel spins. ( two unpaired electrons )

Aryana Nazem 1A
Posts: 40
Joined: Fri Apr 06, 2018 11:04 am

### Re: Electrons in an Orbital

does anyone know if we will be required to draw what the different atomic orbitals looks like?

Aryana Nazem 1A
Posts: 40
Joined: Fri Apr 06, 2018 11:04 am

### Re: Electrons in an Orbital

Also can someone explain how the 4th quantum number ties into this topic?

Chiara Berruto 1K
Posts: 29
Joined: Fri Apr 06, 2018 11:01 am

### Re: Electrons in an Orbital

The fourth quantum number tells us the spin of the electron, it is called the spin magnetic quantum number. This correlates to the fact that two electrons in the same orbital cannot have the same spin.