Octet Rule Exception

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Matthew 1C
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Joined: Fri Sep 29, 2017 7:06 am

Octet Rule Exception

Postby Matthew 1C » Sat Oct 28, 2017 5:10 pm

What is it that allows elements to be excepted from the octet rule? How do we know how many more electrons the element can carry?

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Re: Octet Rule Exception

Postby Chem_Mod » Sat Oct 28, 2017 8:49 pm

Differing element sizes allow for octet rule violations. For example. sulfur is a larger element than oxygen, so it can uses all of its valence electrons to form bonds to other atoms, whereas oxygen cannot due to steric hinderance around the atom. Essentially, there isn't enough room because all of the atoms would be pressed against one another if there were more bonded elements. There are also empty d-orbitals that can interact on elements in lower blocks. The amount of bonds that can be formed generally corresponds to the number of valence electrons.

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