Octets

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Melissa Rebollar 1F
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Octets

Postby Melissa Rebollar 1F » Wed Jul 12, 2017 12:20 am

Could someone please explain why Sulfur can have more than an octet and if that is the only exception? Thank you!

Chem_Mod
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Re: Octets

Postby Chem_Mod » Wed Jul 12, 2017 1:24 am

Remember that sulfur is in row 3 of the periodic table. It therefore has an empty d-orbital that can accept extra electrons. Thus, sulfur can have an expanded octet where it has more than 8 electrons, and in this case it has 10. That is okay. If sulfur however was in row 2, this would not be the case. There are no 2d orbitals and thus any row 2 element cannot have an expanded octet.

sid bauer
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Re: Octets

Postby sid bauer » Tue Jul 18, 2017 11:40 pm

Does that apply for all row 3 atoms? That they can all accept more than 8 electrons? If so, can they all accept a total of 10, just like Sulfur?

Thanks

Michelle Steinberg2J
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Re: Octets

Postby Michelle Steinberg2J » Tue Oct 31, 2017 8:46 pm

sid bauer wrote:Does that apply for all row 3 atoms? That they can all accept more than 8 electrons? If so, can they all accept a total of 10, just like Sulfur?

Thanks


Any element that has an energy shell of n=3 or higher and is also a nonmetal can have an expanded octet. This is because they have access to the D orbital, thus they have the option of filling more shells.

Hope this helps!

Salma Quintanilla 1J
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Re: Octets

Postby Salma Quintanilla 1J » Tue Oct 31, 2017 9:15 pm

What is a resonance hybrid?

Brigita1D
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Re: Octets

Postby Brigita1D » Thu Nov 02, 2017 1:25 pm

Salma Quintanilla 1J wrote:What is a resonance hybrid?


A resonance hybrid is a "blend of structures"(textbook page 81). When we write multiple Lewis structures for one molecule, we are implying that the molecule is a mix of the structures and the electrons are varied throughout the molecule. The "sum" of these structures is the resonance hybrid representation.

ZoeHahn1J
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Re: Octets

Postby ZoeHahn1J » Fri Nov 03, 2017 7:50 pm

Michelle Steinberg 1C wrote:
sid bauer wrote:Does that apply for all row 3 atoms? That they can all accept more than 8 electrons? If so, can they all accept a total of 10, just like Sulfur?

Thanks


Any element that has an energy shell of n=3 or higher and is also a nonmetal can have an expanded octet. This is because they have access to the D orbital, thus they have the option of filling more shells.

Hope this helps!


Thank you! This was very useful! However, why wouldn't silicon be able to have an expanded octet?

Wayland Leung
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Re: Octets

Postby Wayland Leung » Sun Nov 05, 2017 11:28 am

Could someone explain why some elements do not need a full octet?

AtreyiMitra2L
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Re: Octets

Postby AtreyiMitra2L » Sun Nov 05, 2017 6:19 pm

Nonmetal atoms in period 3 and higher can have can expand their octets. This can occur bc 1) the existence of empty d orbitals and 2) The size of the atom. For sulfur, because it is large enough, it can accommodate more electrons than the octet. P and Cl can do the same.


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