What are these?

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What are these?

Postby ashwathinair » Fri Nov 01, 2019 7:23 pm

Exactly what are the elements that are exceptions to the octet rule?

Vanessa Chuang 4F
Posts: 51
Joined: Sat Aug 24, 2019 12:18 am

Re: What are these?

Postby Vanessa Chuang 4F » Fri Nov 01, 2019 8:50 pm

There are actually a fairly decent amount of exceptions to the octet rule. For example, the first 4 elements of the periodic table always have an incomplete octet because it is impossible for them to achieve the full octet.
Elements period 3 and beyond have the capability to have an expanded octet because of the existence of the d orbitals starting when n=3. So as to exactly which elements are an exception, there are actually a lot more than can probably be listed at once.

Suraj Doshi 2G
Posts: 100
Joined: Fri Aug 02, 2019 12:15 am

Re: What are these?

Postby Suraj Doshi 2G » Fri Nov 01, 2019 8:54 pm

I believe the two elements are commonly boron and aluminum as they need 5e- to complete their octet.

Jainam Shah 4I
Posts: 130
Joined: Fri Aug 30, 2019 12:16 am

Re: What are these?

Postby Jainam Shah 4I » Fri Nov 01, 2019 9:27 pm

Boron and Aluminum can actually not have an octet and be stable. Expanded octets include elements in the third energy level's whose d orbitals are empty. Hence, these d-orbitals can accommodate more than 8 electrons. Common ones include P, Cl, S, and so forth

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