octet exceptions

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Nicholas Kull_3L
Posts: 30
Joined: Fri Sep 28, 2018 12:23 am

octet exceptions

Postby Nicholas Kull_3L » Fri Nov 09, 2018 10:52 am

What are elements with octet exceptions and why do these occur?

Rithana Srikanth 3L
Posts: 30
Joined: Fri Sep 28, 2018 12:26 am

Re: octet exceptions

Postby Rithana Srikanth 3L » Fri Nov 09, 2018 10:56 am

Elements that can have expanded octet include P, S, Cl - elements from Period 3 and beyond. This is because these elements have d-orbitals that can expand to accommodate more electrons.

Tuong Nguyen 2I
Posts: 71
Joined: Fri Sep 28, 2018 12:26 am
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Re: octet exceptions

Postby Tuong Nguyen 2I » Fri Nov 09, 2018 10:57 am

The first four elements (H, He, Li, Be) can have an incomplete octet since their electrons only pertain to the s-orbital which requires two electrons to be stable. Group 13 (B, Al, etc.) can also have an incomplete octet because that is just the exception that we need to know about. Any element in Period/Row 3 or further is allowed to have an expanded octet because they have an empty d-orbital in which they can store more electrons in.

Hanniel U 2B
Posts: 76
Joined: Fri Sep 28, 2018 12:16 am

Re: octet exceptions

Postby Hanniel U 2B » Fri Nov 09, 2018 11:00 am

The first four elements on the periodic table are elements with octet exceptions.

JT Wechsler 2B
Posts: 62
Joined: Fri Sep 28, 2018 12:16 am

Re: octet exceptions

Postby JT Wechsler 2B » Fri Nov 09, 2018 11:02 am

The first four elements and group 13 elements all can have less than a completed octet. If an element is in period 3 or lower on the periodic table, then they can have greater than 8 electrons because of the d suborbital.


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