He, Li and Be

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Anna De Schutter - 1A
Posts: 66
Joined: Wed Feb 21, 2018 3:01 am

He, Li and Be

Postby Anna De Schutter - 1A » Mon May 21, 2018 5:34 pm

Hi!

I'm a bit confused, how are He, Li and Be exceptions to the octet rule? If they don't aim to have 8 valence electrons, what do they do then?

Thank you!
Anna De Schutter - section 1A

Priscilla Okaiteye
Posts: 61
Joined: Tue Nov 21, 2017 3:02 am

Re: He, Li and Be

Postby Priscilla Okaiteye » Mon May 21, 2018 8:11 pm

Okay, so Helium only has 2 electrons which means it doesn't need 8 or an octet. It is a noble gas. All its shells are filled. Now Lithium and beryllium are sort of the same in the sense that they don't need 8 electrons. They do give away valence electrons to have their next shell filled.

Maria Roman 1A
Posts: 30
Joined: Fri Apr 06, 2018 11:04 am

Re: He, Li and Be

Postby Maria Roman 1A » Wed May 23, 2018 10:43 pm

generally the rule is that below period three, the elements will be exempt from the octet rule

Carlos De La Torre 2L
Posts: 60
Joined: Tue Oct 09, 2018 12:16 am

Re: He, Li and Be

Postby Carlos De La Torre 2L » Sun Oct 28, 2018 8:35 pm

The rule is that below the third period the octet rule is followed (except for the first 4 elements), but after is when extended orbitals come into play


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