EXPANDED OCTET

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chrisdinkel_4E
Posts: 33
Joined: Fri Sep 28, 2018 12:17 am

EXPANDED OCTET

Postby chrisdinkel_4E » Mon Nov 05, 2018 12:05 am

Why can group 13 elements have incomplete octets?

Nada AbouHaiba 1I
Posts: 77
Joined: Fri Sep 28, 2018 12:28 am
Been upvoted: 1 time

Re: EXPANDED OCTET

Postby Nada AbouHaiba 1I » Mon Nov 05, 2018 12:07 am

In order for them to have a complete octet they would need to create 5 bonds and that doesn't happen

404905747
Posts: 29
Joined: Fri Sep 28, 2018 12:17 am

Re: EXPANDED OCTET

Postby 404905747 » Mon Nov 05, 2018 1:16 am

can all elements in group 13 have incomplete octet?

Brian Chang 2H
Posts: 65
Joined: Fri Sep 28, 2018 12:17 am

Re: EXPANDED OCTET

Postby Brian Chang 2H » Mon Nov 05, 2018 1:10 pm

Technically, any element in the 3rd row of the periodic table (and beyond) can form an expanded octet.

Realistically, we only see it for the p-block elements in the 3rd row and beyond. (Ie. P, S, CL)

This is because elements in the 3rd have access to the 3-d-orbitals so they can have more than 8 electrons in a shell.

The octet guideline itself comes from the S and P orbitals, which can hold 2 and 6 electrons respectively. Hence, 8 for octet. So it's only really a rule up till Neon.

Bijan Mehdizadeh 1B
Posts: 73
Joined: Fri Sep 28, 2018 12:15 am

Re: EXPANDED OCTET

Postby Bijan Mehdizadeh 1B » Fri Nov 09, 2018 3:21 pm

Like Brian said, any element in period 3 and beyond can have an expanded octet. If it makes it easier, I think of it this way: the element in period 2 that has the most amount of ground state electrons is Ne. Ne had 10 e-, but with those 10, it is stable, whereas fluorine has 9 e- and is likely to want to lose an e- to have an octet. However, the elements in the third row like Na and Al all have more electrons than 10 and are less likely to form an octet due to the fact that they would have to lose an exorbitant amount of e- for that to happen, which is chemically unlikely.

isarose0
Posts: 62
Joined: Fri Sep 28, 2018 12:15 am

Re: EXPANDED OCTET

Postby isarose0 » Fri Nov 09, 2018 4:58 pm

Group 13 elements can have expanded octets because they have access to their 3-d orbital since its not filled


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