Octet Exceptions

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Donna Nguyen 2L
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Joined: Sat Aug 24, 2019 12:17 am

Octet Exceptions

Postby Donna Nguyen 2L » Tue Nov 12, 2019 5:18 pm

Why are the elements H, He, Li, and Be exceptions to the octet rule?

Zaynab Hashm 2I
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Re: Octet Exceptions

Postby Zaynab Hashm 2I » Tue Nov 12, 2019 5:33 pm

H and He only require 2 electrons for their highest energy shell to be full (they only have 1s that needs to be filled with only 2 electrons rather than 8).

Li and Be are metals that tend to lose electrons rather than gain them to get a positive charge, hence going back to the lower noble gas configuration which is He and that, as mentioned before, has only 2 electrons in the outermost (and only) shell.

Posts: 101
Joined: Thu Jul 11, 2019 12:17 am

Re: Octet Exceptions

Postby dtolentino1E » Tue Nov 12, 2019 5:57 pm

their valence shells are 1s and 2s, which don't even have enough orbitals for eight electrons. these elements are stable with just 2 (H, He) or 4 (Li, Be)

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