homework 2.43 part e  [ENDORSED]

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Vivian Gonzalez 1A
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homework 2.43 part e

Postby Vivian Gonzalez 1A » Sat May 05, 2018 10:55 pm

The question asks what is the ground-state electron configuration expected for each of the following elements: (e) tungsten?
The answer is: [Xe] 4f^14 5d^4 6s^2
I understand where the 5d^4 and 6s^2 came from, however, I'm still confused on how to get 4f^14. Can someone please explain?

Taizha 1C
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Re: homework 2.43 part e

Postby Taizha 1C » Sat May 05, 2018 11:01 pm

the answer is 4f^14 because you need to include the configuration for the f-block, so not including La, there would be 14 e- total.

Vivian Gonzalez 1A
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Re: homework 2.43 part e

Postby Vivian Gonzalez 1A » Sat May 05, 2018 11:06 pm

I see. So the f block lies in between the 6s-7s and 5d/6d rows?

Jade Corpus-Sapida 1G
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Re: homework 2.43 part e

Postby Jade Corpus-Sapida 1G » Sat May 05, 2018 11:57 pm

Vivian Gonzalez 1A wrote:I see. So the f block lies in between the 6s-7s and 5d/6d rows?


Yes it does. If you look at the periodic table there should be 2 boxes labelled "57-71 lanthanoids" and "89-103 actinoids", where that section leads to the portion below as an extension.

Anna De Schutter - 1A
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Re: homework 2.43 part e

Postby Anna De Schutter - 1A » Sun May 06, 2018 2:32 pm

But why is it 5d^4 6s^2 and not 5d^5 6s^1? I thought it was more stable to have d^5 than d^4 (as well as d^10 instead of d^9)?

Also are we expected to know how to include the f-block in electron configurations? I'm not sure but I thought we had to know how to do electron configurations of the s-block, the p-block, and the first row of the d-block. Or did I misunderstand that?

Thank you!! :)
Anna De Schutter - section 1A

Bree Perkins 1E
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Re: homework 2.43 part e

Postby Bree Perkins 1E » Mon May 07, 2018 1:32 pm

Anna De Schutter - 1A wrote:But why is it 5d^4 6s^2 and not 5d^5 6s^1? I thought it was more stable to have d^5 than d^4 (as well as d^10 instead of d^9)?

Also are we expected to know how to include the f-block in electron configurations? I'm not sure but I thought we had to know how to do electron configurations of the s-block, the p-block, and the first row of the d-block. Or did I misunderstand that?

Thank you!! :)
Anna De Schutter - section 1A


I have the same question. Why would it not be

Haison Nguyen 1I
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Re: homework 2.43 part e

Postby Haison Nguyen 1I » Mon May 07, 2018 1:40 pm

I'm also slightly confused with this problem. Why does 4f^14 come before 5d^4 and 6s^2?

Chem_Mod
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Re: homework 2.43 part e  [ENDORSED]

Postby Chem_Mod » Mon May 07, 2018 3:36 pm

viewtopic.php?f=20&t=31289&p=99159&hilit=tungsten&sid=842f05fb5698f1c9857c0aa71062966f#p99159

See this post for an explanation on Tungsten stability.

As for why the 4f14 comes first, some choose to list it in order of the value of n. As for how it's filled, see the attached picture.
Attachments
Orbital Fill.jpg

BriannaParrington-1B
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Re: homework 2.43 part e

Postby BriannaParrington-1B » Sat May 12, 2018 12:34 pm

Doesn't 4f^14 come first because when doing electron configurations, you list it in increasing principal quantum number(n)?


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