Beryllium exception

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Jessica Lutz 2E
Posts: 56
Joined: Fri Sep 29, 2017 7:04 am

Beryllium exception

Postby Jessica Lutz 2E » Tue Nov 07, 2017 3:10 pm

In 3.67, the central Beryllium atom in BeCl2 is allowed to only have 4 electrons. Why is this an exception?

sandros
Posts: 19
Joined: Fri Sep 29, 2017 7:07 am

Re: Beryllium exception

Postby sandros » Tue Nov 07, 2017 3:19 pm

Beryllium and lithium both form a duplet instead of forming an octet. This is mainly related to the fact that the energy required to give Li and Be a full octet is much higher than the energy required to give up one or two electrons and form a duplet (the same way as helium does).

Suhail Zaveri
Posts: 24
Joined: Sat Jul 22, 2017 3:01 am

Re: Beryllium exception

Postby Suhail Zaveri » Tue Nov 07, 2017 3:44 pm

This is only because beryllium only has 4 valence electrons, it does not have enough electrons in order to fulfill the octet rule, therefore it does not follow the octet rule due to limited electrons.

Rachel N 1I
Posts: 48
Joined: Thu Jul 27, 2017 3:00 am

Re: Beryllium exception

Postby Rachel N 1I » Fri Nov 10, 2017 11:31 am

There are also multiple exceptions to the octet rule including boron and aluminum

Clarissa Molina 1D
Posts: 55
Joined: Fri Sep 29, 2017 7:04 am

Re: Beryllium exception

Postby Clarissa Molina 1D » Sat Dec 09, 2017 1:47 am

Are Be and Li the only atoms that form duplets or do other atoms form duplets as well?


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