Number of valence electrons

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Jacob Puchalski 1G
Posts: 97
Joined: Fri Aug 09, 2019 12:16 am

Number of valence electrons

Postby Jacob Puchalski 1G » Wed Oct 23, 2019 6:05 pm

Is it ever possible to have more than 8 valence electrons?

Rachel Yu 1G
Posts: 113
Joined: Fri Aug 09, 2019 12:15 am

Re: Number of valence electrons

Postby Rachel Yu 1G » Wed Oct 23, 2019 6:10 pm

There are some instances where an atom can hold more than eight valence electrons, it is called an expanded valence shell/expanded octet. One example of this would be PCL5. I don't think we need to know about this for the basics of Lewis structures though.

Daria Azizad 1K
Posts: 116
Joined: Thu Jul 25, 2019 12:15 am

Re: Number of valence electrons

Postby Daria Azizad 1K » Wed Oct 23, 2019 7:14 pm

Elements in the third period and after generally have exceptions to the octet rule where they can take on more electrons than eight. However, prior to that, H and He will not follow the octet rule, but rather the "duet rule" because they will only try to fill up their s orbital. Boron also sometimes forms compounds where it is electron deficient, however compounds where it does obtain the octet will be more favorable.

AArmellini_1I
Posts: 107
Joined: Fri Aug 09, 2019 12:15 am

Re: Number of valence electrons

Postby AArmellini_1I » Wed Oct 23, 2019 7:46 pm

I believe we are covering this either Friday or next week in class!


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