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Beryllium exception

Posted: Tue Nov 07, 2017 3:10 pm
by Jessica Lutz 2E
In 3.67, the central Beryllium atom in BeCl2 is allowed to only have 4 electrons. Why is this an exception?

Re: Beryllium exception

Posted: Tue Nov 07, 2017 3:19 pm
by sandros
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).

Re: Beryllium exception

Posted: Tue Nov 07, 2017 3:44 pm
by Suhail Zaveri
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.

Re: Beryllium exception

Posted: Fri Nov 10, 2017 11:31 am
by Rachel N 1I
There are also multiple exceptions to the octet rule including boron and aluminum

Re: Beryllium exception

Posted: Sat Dec 09, 2017 1:47 am
by Clarissa Molina 1D
Are Be and Li the only atoms that form duplets or do other atoms form duplets as well?