expanded octet

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Sophia Dinh 1D
Posts: 100
Joined: Thu Jul 25, 2019 12:15 am

expanded octet

Postby Sophia Dinh 1D » Tue Nov 12, 2019 2:08 pm

When can you assume the octet can expand?

Kallista McCarty 1C
Posts: 212
Joined: Wed Sep 18, 2019 12:18 am

Re: expanded octet

Postby Kallista McCarty 1C » Tue Nov 12, 2019 2:09 pm

The octet can expand past the second row

Daniel Toscano 1L
Posts: 95
Joined: Tue Nov 13, 2018 12:18 am

Re: expanded octet

Postby Daniel Toscano 1L » Tue Nov 12, 2019 5:39 pm

If the element is in the 3rd row or under in the periodic table, then it can have an expanded octet as the third row has access to the d-block, which can hold ten more electrons if needed.

Ashley Kim 3F
Posts: 50
Joined: Thu Jul 25, 2019 12:17 am

Re: expanded octet

Postby Ashley Kim 3F » Tue Nov 12, 2019 5:59 pm

Elements with orbitals in the d-block can have expanded octets. However, although P, S, and Cl do not have orbitals in the d-block, they are exceptions to the octet rule and can also hold more electrons than the standard octet.

Caitlin Ciardelli 3E
Posts: 44
Joined: Wed Sep 18, 2019 12:19 am

Re: expanded octet

Postby Caitlin Ciardelli 3E » Fri Nov 15, 2019 12:49 am

The elements that are in row three and below can have expanded octets. This is due to the fact that the elements row three and below can utilize the d orbital, allowing an additional ten electrons after the initial octet. Row 2 and above however, is limited to an octet, eight electrons, because they can only utilize s and p orbitals.

Diana A 2L
Posts: 106
Joined: Sat Aug 17, 2019 12:16 am
Been upvoted: 1 time

Re: expanded octet

Postby Diana A 2L » Sun Nov 24, 2019 11:56 pm

Why do P, S, and Cl have expanded octets if they don't have d-orbitals? It doesn't make much sense.

AronCainBayot2K
Posts: 101
Joined: Fri Aug 30, 2019 12:17 am

Re: expanded octet

Postby AronCainBayot2K » Mon Nov 25, 2019 7:43 am

Elements that can have expanded octets include the 3rd row and every element below. This is due to the d-block with some elements as an exception to this rule. Elements above the third row must fulfill the octet rule when drawing a lewis structure.

Kaitlynn Tran 3F
Posts: 54
Joined: Wed Sep 18, 2019 12:20 am

Re: expanded octet

Postby Kaitlynn Tran 3F » Fri Dec 06, 2019 12:47 pm

Most atoms after P on the periodic table in the d-block can have an expanded octet.


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