Exceeding the Octet Rule

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805291863
Posts: 85
Joined: Sat Sep 14, 2019 12:16 am

Exceeding the Octet Rule

Postby 805291863 » Sun Oct 27, 2019 2:52 pm

During lecture, Dr. Lavelle explained that P, S, and Cl can accommodate more than 8 valence electrons. Does this mean they can have 10 valence electrons and only 10? In other words, do they only use one d-orbital when bonding with other atoms?

Elena Bell 1C
Posts: 59
Joined: Thu Jul 11, 2019 12:16 am

Re: Exceeding the Octet Rule

Postby Elena Bell 1C » Sun Oct 27, 2019 5:32 pm

I think it was meant that in that one particular example it had 10 valence electrons. I'm not sure if it necessarily meant if had to have 10. I was also a little confused as to where he got the 10 though.

RoshniVarmaDis1K
Posts: 51
Joined: Sat Aug 24, 2019 12:16 am

Re: Exceeding the Octet Rule

Postby RoshniVarmaDis1K » Sun Oct 27, 2019 5:35 pm

The example had 10 electrons on the central atoms, but there are situations where expanded octets can be even larger.

For example, SF6 has 12 electrons on the central atoms.

Elizabeth Harty 1A
Posts: 106
Joined: Sat Jul 20, 2019 12:16 am

Re: Exceeding the Octet Rule

Postby Elizabeth Harty 1A » Sun Oct 27, 2019 5:42 pm

I think it depends which atoms are being bonded.

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

Re: Exceeding the Octet Rule

Postby gferg21 » Sun Oct 27, 2019 5:43 pm

Only the central atom has 10 electrons in an expanded octet, and the d-orbital has a maximum of 10 electrons in it, so therefore the central atom can accept 5 single bonds.

Sean Tran 2K
Posts: 60
Joined: Sat Aug 17, 2019 12:17 am

Re: Exceeding the Octet Rule

Postby Sean Tran 2K » Sun Oct 27, 2019 6:38 pm

Central atoms in the 3rd period or further down are able to accommodate more than 8 electrons due to having the d-orbitals available, as d-orbitals start becoming available at n=3.


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