What are considered thhe e- in the outer shell?

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Cowasjee_Sanaea_3E
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Joined: Fri Jul 22, 2016 3:00 am

What are considered thhe e- in the outer shell?

Postby Cowasjee_Sanaea_3E » Wed Oct 19, 2016 10:59 pm

Hi there!

I'm confused on what we should consider to be the electrons in the outer shell?

For example I know that for 1s^2 2s^2 2p^6, the number of electrons in the outer shell would be 8 because you would look at the number of electrons in the highest energy level (or valence electrons).
But in that case, how many electrons would be in the outer shell for Ti: [Ar] 3d^2 4s^2, would it be 2 electrons because the highest energy level is 4 and it has 2 electrons in that energy level (valence electrons)? or would it be 4 electrons because you would count all the electrons after the noble gas as being part of the outer shell?

And are valence electrons the same as the electrons in the outer most shell?

Thanks in advance!

Alexander_Chang_1I
Posts: 18
Joined: Wed Sep 21, 2016 2:56 pm

Re: What are considered thhe e- in the outer shell?

Postby Alexander_Chang_1I » Thu Oct 20, 2016 9:31 am

Yes, valence electrons are the same as electrons in the outermost shell.

Kaitlin_Reeves_1C
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Joined: Wed Sep 21, 2016 2:59 pm

Re: What are considered thhe e- in the outer shell?

Postby Kaitlin_Reeves_1C » Thu Oct 20, 2016 3:30 pm

For the electron configurations in the table, the s orbital is listed after the d orbital. Even if an atom, Cobalt for example, doesn’t have a full d orbital but has a full s orbital, would Cobalt use the electrons in the s orbital (since they are on the outside) to bond even though the orbital full? Or would it use the electrons in the d orbital?

TiengTum2D
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Re: What are considered thhe e- in the outer shell?

Postby TiengTum2D » Sun Oct 23, 2016 2:27 am

When forming ions, Cobalt would use the 4s electrons since those electrons are in the highest energy level and furthest away from the nucleus.


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