Electrons in Orbitals

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Alen Huang 2G
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Joined: Wed Sep 30, 2020 9:50 pm

Electrons in Orbitals

Postby Alen Huang 2G » Fri Oct 23, 2020 2:18 pm

How come electrons fill up orbitals with an up spin instead of completely filling that orbital with an up and down spin before moving on? So like why do the last 2 electrons in a carbon atom occupy the 2px state and the 2py state instead of 2 electrons in the 2px state.

Brianne Conway 1D
Posts: 91
Joined: Wed Sep 30, 2020 9:36 pm

Re: Electrons in Orbitals

Postby Brianne Conway 1D » Fri Oct 23, 2020 3:09 pm

I don't know why the first electron in an orbital is specifically spin-up, but I'm pretty sure they occupy different orbitals before filling them up because of the repulsion forces between them, so they'd want to be as far away as possible and thus occupy different orbitals.

DanielHong2L
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Joined: Wed Sep 30, 2020 9:51 pm

Re: Electrons in Orbitals

Postby DanielHong2L » Fri Oct 23, 2020 3:12 pm

Brianne Conway 1H wrote:I don't know why the first electron in an orbital is specifically spin-up, but I'm pretty sure they occupy different orbitals before filling them up because of the repulsion forces between them, so they'd want to be as far away as possible and thus occupy different orbitals.


Also spin-up / spin-down isn't really up nor down.

It's two different variations of electron behavior so there's no particular difference between up nor down except it's to describe that there exists two behaviors which adds further differentiation in electron state.

Sofia Lombardo 2C
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Joined: Wed Sep 30, 2020 9:31 pm

Re: Electrons in Orbitals

Postby Sofia Lombardo 2C » Sun Oct 25, 2020 11:37 am

According to Hund's Rule, electrons are added to degenerate (same energy) orbitals with a parallel spin (so either all facing up or all facing down) before pairing up. I think that this is a result of electron electron repulsion.

SashaAnand2J
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Joined: Wed Sep 30, 2020 9:37 pm

Re: Electrons in Orbitals

Postby SashaAnand2J » Sun Oct 25, 2020 1:00 pm

Hi Alen!
Electrons like to fill up orbitals in order from lowest to highest energy, in terms of filling up s, p, d, f orbitals. This may be the same reason electrons fill up individual orbitals before completing pairs. Adding on to what Brianne said above, electrons are likely to take up locations that will prevent repulsion. By positioning in empty orbitals, electrons avoid these interactions with one another.

Gustavo_Chavez_1K
Posts: 87
Joined: Wed Sep 30, 2020 9:46 pm

Re: Electrons in Orbitals

Postby Gustavo_Chavez_1K » Sun Oct 25, 2020 5:33 pm

Honestly this is a really good question! It would make sense to just fill up an orbital before moving to the next, however electron's are all negatively charged. Since they are all negatively charged, electrons repel and want to stay far away from one another as possible. To do this, they fill up all the different orbitals before pairing with electrons already in an orbital. Hope this answers the question, if you want to read up on more of the specifics you should look into Hund's Rules.


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