valence electrons

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Katherine Wu 1H
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Joined: Fri Aug 30, 2019 12:15 am
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valence electrons

Postby Katherine Wu 1H » Thu Oct 24, 2019 4:27 pm

Give the number of valence electrons (including d electrons) for each of the following elements:
a. Sb b. Si c. Mn d. B

I think I understand how to find the valence electrons for b, c, and d. Si: 4, Mn: 7, B: 3. I don't understand how the answer for a. (5 electrons) came to be?

Anthony Hatashita 4H
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Joined: Wed Sep 18, 2019 12:21 am

Re: valence electrons

Postby Anthony Hatashita 4H » Thu Oct 24, 2019 4:29 pm

I'm not sure to be honest, but I think it has to do with 4s, 4p, and 4d being filled, leaving 5s and 5p electrons.

Cooper Baddley 1F
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Joined: Wed Sep 18, 2019 12:19 am

Re: valence electrons

Postby Cooper Baddley 1F » Thu Oct 24, 2019 4:43 pm

I think it comes from the element's unfilled outer orbital as it only has 5s2 and 5p3 which in total adds up to 5 valence electrons.

Suraj Doshi 2G
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Joined: Fri Aug 02, 2019 12:15 am

Re: valence electrons

Postby Suraj Doshi 2G » Thu Oct 24, 2019 5:56 pm

The five valence electrons come from the breakdown:

3e from the p-orbital and then 2e from the s-orbital.

I believe that for antimony the electrons are pulled from the s orbital too as they are further away from the nucleus.

William Francis 2E
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Joined: Wed Sep 18, 2019 12:20 am

Re: valence electrons

Postby William Francis 2E » Thu Oct 24, 2019 6:01 pm

Antimony (Sb) has an electron configuration of [Kr] 4d10 5s2 5p3. Valence electrons are the electrons in an atoms outermost shell. In this case, the fifth shell of electrons is the outermost and it contains 2 electrons in the s subshell and 3 in the p subshell. So, in total, it has 5 valence electrons.

Daniel Martinez 1k
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Joined: Wed Sep 18, 2019 12:16 am

Re: valence electrons

Postby Daniel Martinez 1k » Thu Oct 24, 2019 6:20 pm

Sb has the electron configuration [Kr] 4d^10 5s^2 5p^3.
Since the 4th shell is completely filled, we only focus on the electrons from the fifth shell. With that being said, we only have 5 valence electrons in the 5th shell (2 e- from s-shell & 3 e- from p-shell).

Jingyao Chen 4H
Posts: 49
Joined: Fri Sep 27, 2019 12:19 am

Re: valence electrons

Postby Jingyao Chen 4H » Thu Oct 24, 2019 8:49 pm

The electrons in 5s and 5p are in a high energy level than 4d. Therefore, valence electrons, and the electrons that gets stepped away first are in 5s and 5p.

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