2.55 - what does valence-shell configuration mean?

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Anna De Schutter - 1A
Posts: 66
Joined: Wed Feb 21, 2018 3:01 am

2.55 - what does valence-shell configuration mean?

Postby Anna De Schutter - 1A » Mon May 07, 2018 10:08 pm

Hi!

Problem 2.55 says: "Give the notation for the valence-shell configuration (including the outermost d-electrons)". I'm a bit confused, what does valence-shell configuration mean? For example, for part b it asks us to give the valence-shell configuration of group 15 elements and I was just going to answer np^3 because I thought that was the outermost shell (the correct answer for the group 15 elements is ns^2 np^3, why do we add ns^2?). Can someone explain this to me?

Thank you so much!
Anna De Schutter - section 1A

Bianca Nguyen 1B
Posts: 36
Joined: Fri Apr 06, 2018 11:04 am

Re: 2.55 - what does valence-shell configuration mean?

Postby Bianca Nguyen 1B » Tue May 08, 2018 12:43 am

A shell basically represents a principle quantum number. You can think of it as n=shell, l=subshell, and ml=orbitals of a subshell. For every period in the periodic table, the s and p block will always be in the same shell or have the same principle quantum number (for ex., 2s and 2p, 3s and 3p). So if you write down the p block for the valence-shell configuration, you must write down the s as well since they are in the same shell.

Anna De Schutter - 1A
Posts: 66
Joined: Wed Feb 21, 2018 3:01 am

Re: 2.55 - what does valence-shell configuration mean?

Postby Anna De Schutter - 1A » Thu May 10, 2018 3:31 pm

Thank you!! :)

Madison Hacker 1L
Posts: 30
Joined: Fri Apr 06, 2018 11:03 am

Re: 2.55 - what does valence-shell configuration mean?

Postby Madison Hacker 1L » Sun May 13, 2018 11:03 pm

Something else to remember for this is that the valence shell is the outermost electron. Hope this helps!


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