expanded octet

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rkang00
Posts: 69
Joined: Fri Sep 28, 2018 12:25 am

expanded octet

Postby rkang00 » Tue Nov 06, 2018 8:48 pm

How do you know that an atom has only one additional bond in addition to an octet? is the number of remaining orbitals the way to determine it? (take bromate for example - how do you know it's just 5 bonds on bromine and not 6)

Christine Chow 4G
Posts: 43
Joined: Fri Sep 28, 2018 12:28 am

Re: expanded octet

Postby Christine Chow 4G » Tue Nov 06, 2018 9:03 pm

We know by looking at the periodic table that Bromine has 7 valence electrons. If you have Bromine make 6 bonds, there will be one valence electron left over (which would make it a radical and not the most stable Lewis structure). However, if Bromine had 5 bonds and one lone pair, it satisfies the Formal Charge rule (7 valence e- - (2lonepaire- + (10/2 bonded e-))=0 and Bromine will be stable

ElliotPourdavoud 1A
Posts: 36
Joined: Fri Sep 28, 2018 12:16 am

Re: expanded octet

Postby ElliotPourdavoud 1A » Tue Nov 06, 2018 9:17 pm

I believe that formal charge is a good way to see if an atom can have an expanded octet to make it the most stable.


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