Tuesday, April 15, 2008

Reply To Hao Eng's Question: Does SO2 have double bonds?

Hao Eng asked: Does SO2 have double bonds between them?

My reply: Yes!


Both sulphur and oxygen has 6 electrons in their outermost shell. In order to have 8 electrons for oxygen atoms (octet structure ), sulphur needs to share 2 electrons with EACH oxygen.

Alas, then sulphur will have 10 electrons!!! Which is not octet structure!

In tertiary levels ( jc/poly/uni), sulphur can 'expand octet' which is a term refering to an atom that has more than 8 electrons in its outermost shell ...

A piece of good news. You are not expected to draw this structure for O-level Exam.....
ms pang :)

p/s: i didnt draw this diagram, i got it from this website:

http://www.btinternet.com/~chemistry.diagrams/molecular_diagrams.htm