central atoms with more than 4 bonds

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leediane0916
Posts: 31
Joined: Fri Sep 28, 2018 12:29 am

central atoms with more than 4 bonds

Postby leediane0916 » Tue Oct 30, 2018 3:04 pm

yesterday in class dr lavelle drew the SO4 2- atom's lewis structure and said that it is most accurate when the central atom (s) has two double bonds and two single bonds, which represents 12 electrons - how does that work?

ChathuriGunasekera1D
Posts: 78
Joined: Fri Sep 28, 2018 12:17 am

Re: central atoms with more than 4 bonds

Postby ChathuriGunasekera1D » Tue Oct 30, 2018 3:22 pm

S has 6 valence electrons so it's allowed to make two double bonds (takes 4 electrons) and two single bonds (takes 2 electrons). You want the central atom to have as few lone pairs as possible for stability purposes, that's why S makes some double bonds too

Courtney McHargue 1I
Posts: 56
Joined: Fri Sep 28, 2018 12:17 am

Re: central atoms with more than 4 bonds

Postby Courtney McHargue 1I » Tue Oct 30, 2018 3:45 pm

Lavelle said that elements in the third period and below are able to hold more than 8 valence electrons and stay stable. Since sulfur (S) is in the third period it can follow this rule, which is why it can hold 12 electrons.

Letizia Ye 4F
Posts: 62
Joined: Fri Sep 28, 2018 12:28 am

Re: central atoms with more than 4 bonds

Postby Letizia Ye 4F » Tue Oct 30, 2018 4:30 pm

Since sulfur is a p-block element, it's able to have an expanded octet, since it has more room in its energy level to form other bonds.


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