Electron Configuratin

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Saima Salam 3J
Posts: 32
Joined: Fri Sep 28, 2018 12:25 am

Electron Configuratin

Postby Saima Salam 3J » Thu Oct 18, 2018 10:09 pm

When we write the ground state for an ion such as Tl^3+ it is [Xe] 4f^145d^106s^26p^1 but then we lose 3 electrons so the final configuration would be [Xe]4f^145d^10. Why do we only remove electrons from the p-subshell and the s-subshell but never the d or f subshells?

Thank you in advance!

LeannaPhan14BDis1D
Posts: 57
Joined: Fri Sep 28, 2018 12:16 am

Re: Electron Configuratin

Postby LeannaPhan14BDis1D » Thu Oct 18, 2018 11:21 pm

I would think it is due to the s orbitals having lower energy, but this is a very good question. Now that I think about it I do not understand it either...

Rachel Dang 1H
Posts: 32
Joined: Fri Sep 28, 2018 12:17 am

Re: Electron Configuratin

Postby Rachel Dang 1H » Fri Oct 19, 2018 2:00 pm

We lose the electrons from the s and p subshells first because if you look at the configuration, those subshells are within the 6th and outermost shell. The f and d subshells are within the 4th and 5th and closer to the nucleus and harder to "steal" in comparison to the electrons in the 6th shell.

mayra martinez 1D
Posts: 32
Joined: Fri Sep 28, 2018 12:17 am

Re: Electron Configuratin

Postby mayra martinez 1D » Fri Oct 19, 2018 5:12 pm

Yeah, the close to the nucleus,the harder to steal and so the electrons from subshells further away will be the ones to go first due to less resistance.

John Kim Lec3Dis3L
Posts: 23
Joined: Fri Sep 28, 2018 12:17 am

Re: Electron Configuratin

Postby John Kim Lec3Dis3L » Sat Oct 20, 2018 12:58 am

Just think of it like you can only start from the rightmost electrons on. This was actually touched upon in class: the inner sub-shells of electrons actually block the effects of the positively charged nucleus on outer sub-shells.

Kyither Min 2K
Posts: 60
Joined: Wed Oct 03, 2018 12:15 am

Re: Electron Configuratin

Postby Kyither Min 2K » Fri Oct 26, 2018 8:22 pm

We could eventually remove the electrons from the d and f orbitals but if you notice the shell number for the d and f orbitals, they're either 1 or 2 shells before the s and p orbitals. When you remove an electron, you take from the outermost shell since they're the easiest to be removed therefore, the s and p orbitals are removed first before the d and f.


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