Sulfate Ion

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Vincent Chiang 1L
Posts: 54
Joined: Fri Sep 29, 2017 7:05 am

Sulfate Ion

Postby Vincent Chiang 1L » Sun Oct 29, 2017 4:56 pm

When you draw the sulfate ion (SO4)^2-, how can the sulfur share six electrons and have a total of 12? I thought the max was 8... Thanks in advance.

Tanaisha Italia 1B
Posts: 55
Joined: Fri Sep 29, 2017 7:04 am

Re: Sulfate Ion

Postby Tanaisha Italia 1B » Sun Oct 29, 2017 5:13 pm

This is an anion and thus the compound has gained two more electrons. Suphur has 6 valence electrons, plus is sharing 6 electrons with oxygen. Therefore, the total is 12. Sulphur has two single bonds and two double bonds distributed between the 4 oxygen atoms. since each single bond shares 2 electrons and each double shares 4, this equals 12 in total.

Annalise Eder 2L
Posts: 49
Joined: Sat Jul 22, 2017 3:01 am

Re: Sulfate Ion

Postby Annalise Eder 2L » Sun Oct 29, 2017 6:48 pm

Sulfur can have an expanded octet by using the empty 3d orbitals to accommodate "extra" electrons.

Peri Bingham 1G
Posts: 50
Joined: Fri Sep 29, 2017 7:03 am

Re: Sulfate Ion

Postby Peri Bingham 1G » Mon Oct 30, 2017 1:24 pm

Atoms in period 3 or higher, like sulfur, can have more than 8 valence electrons because they can occupy the d-orbitals.

Curtis Tam 1J
Posts: 105
Joined: Thu Jul 13, 2017 3:00 am

Re: Sulfate Ion

Postby Curtis Tam 1J » Thu Nov 02, 2017 2:20 pm

If you were to calculate the formal charge of the sulfur in this Lewis structure, you would get a formal charge of 0, which is favorable.

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