Expanded Octet

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juleschang16
Posts: 55
Joined: Fri Sep 28, 2018 12:19 am

Expanded Octet

Postby juleschang16 » Fri Nov 16, 2018 6:17 pm

What are the expanded octet rules? Which elements can have expanded octets?

Alli Hinmon 3E
Posts: 30
Joined: Wed Nov 08, 2017 3:00 am

Re: Expanded Octet

Postby Alli Hinmon 3E » Fri Nov 16, 2018 6:21 pm

Any element in the 3rd period and down can have an expanded octet. Also row 13 has some exceptions to the octet rule. Remember H only can can 1 bond!

monikac4k
Posts: 56
Joined: Fri Sep 28, 2018 12:25 am

Re: Expanded Octet

Postby monikac4k » Fri Nov 16, 2018 7:15 pm

As we learned the wave function numbers and their meaning we learned that we are dealing with a d orbital when l=2. For l to equal 2 the value of n must be at least 3. This means elements in the 3rd period possess a d sub-shell. However, we also learned that the electron configuration for an element like phosphorus is [Ne] 3s2 3p3. There are no electrons within the d subshell. From these observations we can conclude that any element in period 3 or higher possesses an empty d subshell, allowing them to possess more than just the normal octet of electrons.

Maria Nabagala 3E
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Joined: Fri Sep 28, 2018 12:24 am
Been upvoted: 2 times

Re: Expanded Octet

Postby Maria Nabagala 3E » Fri Nov 16, 2018 8:46 pm

Elements with expanded octets can have more than 8 electrons. Usually elements in period 3 have expanded octets meaning you can put more than 8 electrons on those elements

Isabelle_Maletz_3E
Posts: 27
Joined: Fri Apr 06, 2018 11:03 am

Re: Expanded Octet

Postby Isabelle_Maletz_3E » Sun Nov 18, 2018 10:57 pm

In order to have an expanded octet, the central atom must be in an energy level that would allow this. Therefore only elements that have access to a d-orbital can typically have expanded octets.

Katie_Duong_1D
Posts: 69
Joined: Fri Sep 28, 2018 12:27 am

Re: Expanded Octet

Postby Katie_Duong_1D » Sun Nov 25, 2018 10:33 pm

Any element period 3 and below can have an expanded octet because they can also have d orbitals (10 valence electrons). For example, Phosphorus can have an expanded octet because it is in period 3, while Nitrogen cannot have an expanded octet because it is in period 2.

Sheridan Slaterbeck 1J
Posts: 62
Joined: Fri Sep 28, 2018 12:27 am

Re: Expanded Octet

Postby Sheridan Slaterbeck 1J » Sun Nov 25, 2018 10:34 pm

Row 2 elements usually never have expanded octet.

705022748
Posts: 26
Joined: Fri Sep 28, 2018 12:25 am

Re: Expanded Octet

Postby 705022748 » Mon Nov 26, 2018 1:03 am

Expanded octet is when an element can have more than 8 electrons, such as elements in the d-orbital.

405098546
Posts: 32
Joined: Fri Sep 28, 2018 12:24 am

Re: Expanded Octet

Postby 405098546 » Mon Nov 26, 2018 1:42 am

Expanded octet is when an atom can hold more than 8 valence electrons in a lewis structure. So some atoms like sulfur, phosphorous, or chlorine are more prone to expanded octets. This is something you should simply keep in mind.


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