Expanded Octets

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JohnWalkiewicz2J
Posts: 103
Joined: Thu Jul 11, 2019 12:17 am
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Expanded Octets

Postby JohnWalkiewicz2J » Sun Oct 27, 2019 5:14 pm

Hello, can someone explain to me why some atoms can have expanded octets while others cannot? Thank you!

Brian J Cheng 1I
Posts: 115
Joined: Thu Jul 11, 2019 12:15 am

Re: Expanded Octets

Postby Brian J Cheng 1I » Sun Oct 27, 2019 5:17 pm

Expanded octets (otherwise known as exceptions to the octet rule) exist starting with elements with 4s and 3d orbitals. Due to the nature and arrangement of orbitals, the 4s orbitals fill up before the 3d ones do. This allows additional electrons to be added into the empty 3d orbitals, allowing these exception elements to surpass the octet rule. Notable elements are P, S, and Cl.

KarineKim2L
Posts: 100
Joined: Fri Aug 30, 2019 12:16 am

Re: Expanded Octets

Postby KarineKim2L » Sun Oct 27, 2019 5:18 pm

Atoms that have d orbitals can have expanded octets.

gferg21
Posts: 51
Joined: Sat Aug 17, 2019 12:17 am

Re: Expanded Octets

Postby gferg21 » Sun Oct 27, 2019 5:20 pm

Atoms who have an open d-orbital (n is greater than or equal to 3) are able to accept 10 electrons because the d-orbital is able to hold 10 electrons rather than the usual 8. This only works for atoms of elements in the p-block, however.

Eesha Sohail 1D
Posts: 100
Joined: Sat Aug 17, 2019 12:16 am

Re: Expanded Octets

Postby Eesha Sohail 1D » Sun Oct 27, 2019 5:55 pm

So just to clarify, alkali metals and alkaline earth metals cannot make use of an expanded octet? Is it because their outermost shells are on a different energy shell than the rest of their electrons, and there's only 2 electrons max in that shell?


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