Exceptions

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Tracy Tolentino_2E
Posts: 121
Joined: Sat Sep 07, 2019 12:17 am

Exceptions

Postby Tracy Tolentino_2E » Sun Oct 27, 2019 7:39 pm

Can someone explain why H, He, Li and Be are exceptions to the octet rule? And why we choose the atom with the least ionization energy as the central atom?

JonathanS 1H
Posts: 86
Joined: Thu Jul 11, 2019 12:17 am

Re: Exceptions

Postby JonathanS 1H » Sun Oct 27, 2019 7:43 pm

H, He, Li, and Be all want to fill only the 1s orbitals, only wanting 2 e- total. As for the atom with the least ionization energy being the central atom, the lower the ionization energy, the more the atom will hold on to its e-. This means that it will be more likely to bond with multiple atoms and be the central one as it will hold onto bonds tightly.

Maeve Miller 1A
Posts: 51
Joined: Fri Aug 09, 2019 12:16 am

Re: Exceptions

Postby Maeve Miller 1A » Sun Oct 27, 2019 10:27 pm

H, He, Li, and B are exceptions to the rule because they only fill an s-orbital valence shell, which fits 2--not 8 electrons.

Jacob Villar 2C
Posts: 90
Joined: Sat Aug 17, 2019 12:18 am

Re: Exceptions

Postby Jacob Villar 2C » Sun Oct 27, 2019 10:38 pm

H, He, Li, and B are exceptions to the octet rule because their amount of electrons are only enough to reach the 1s orbital, and therefore, the octet rule cannot be applied in these circumstances.


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