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Octet rule question

Posted: Tue Nov 06, 2018 9:13 pm
by longjump
Which atoms MUST form an octet? Do these atoms always form one or does it depend on the molecule?

Re: Octet rule question

Posted: Tue Nov 06, 2018 10:24 pm
by Rian Montagh 2K
Most atoms form an octet, H, He, and Be can have 2 valence, and elements in the 3rd period and up can have expanded octets into the d orbitals. B and Al sometimes only have 6 valence. Also, I believe that free radicals can mess up the octet rule. I am guessing that there are no atoms that MUST have an octet, and that it depends on the specific molecule or ion.

Re: Octet rule question

Posted: Thu Nov 08, 2018 11:53 am
by shaunajava2e
elements in the 3rd period and onwards are able to take advantage of their empty d orbital and expand their octet past the 8 electrons that come with the p and s orbitals.

Re: Octet rule question

Posted: Thu Nov 08, 2018 12:28 pm
by Phoebe Chen 4I
All the elements with orbitals 3p and up have an expanded octet. Everything before that must adhere to the octet rule. However, elements with only 1s orbitals, and elements with only up to 2s orbitals do not adhere to octet rule and instead only need to have 2 valence or bonded electrons.

Re: Octet rule question

Posted: Sun Nov 11, 2018 5:22 pm
by Sang Hyoun Hong 3G
Every element before period 3 should follow the octet rule. Elements in period 3 have access to the d orbital so can have an expanded octet.

Re: Octet rule question

Posted: Wed Nov 14, 2018 12:27 am
by Rebecca Park
Every element after period 2 can follow the octet rule.

Re: Octet rule question

Posted: Thu Nov 15, 2018 12:35 am
by Yixiao Hu 3C
atoms before the period 3 must have a octet rule. Meanwhile, except the central atom, atoms aside should also obey the octet rule