Expanded Octet

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Rohan Kubba Dis 4B
Posts: 50
Joined: Sat Aug 17, 2019 12:18 am

Expanded Octet

Postby Rohan Kubba Dis 4B » Sat Nov 02, 2019 11:08 am

I understand that some elements like S and P can have more than 8 valence electrons, however, is their a way to determine what other elements have the same condition? How would you derive the amount of valence electrons for an element like these? Do we just memorize these exceptions in the table and what other ones are there?

Sarah Zhari 1D
Posts: 82
Joined: Sat Sep 14, 2019 12:16 am

Re: Expanded Octet

Postby Sarah Zhari 1D » Sat Nov 02, 2019 11:10 am

Elements from the third period onwards generally can have an expanded octet because they have an empty 3d orbital which can accommodate for additional electrons.

Jasmine Summers 4G
Posts: 50
Joined: Wed Sep 18, 2019 12:17 am

Re: Expanded Octet

Postby Jasmine Summers 4G » Sat Nov 02, 2019 11:53 am

From my understanding, any elements past phosphorus can ave expanded octets due to the having d orbitals that will hold additional eletrons.

Posts: 55
Joined: Fri Sep 20, 2019 12:17 am

Re: Expanded Octet

Postby kpang_4H » Sat Nov 02, 2019 11:59 am

Any element from row 3 and beyond can have expanded octet because when n=3, l=0,1,2 which means elements in the third row have access to a 3d orbital, but none of the third row elements have any electrons in that orbital yet, so they can accommodate more electrons. Elements in the fourth row have a 4d orbital that is unused, etc.

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