[pele]

Please help me with bond angles in molecule of SOCl2 !!! What angles approximately are there in molecule and how can I know that?

P.S sorry about my English

[Yggdrasil]

The first step is to draw a lewis structure of SOCl₂

[pele]

Ok.I think I managed to draw it, but  I still don't have no idea about angles.

[english]

What molecular geometry can you infer from the VSEPR model?

[pele]

I don't know. I tried to use isis/draw and search google, but no results

[english]

I don't know. I tried to use isis/draw and search google, but no results

http://en.wikipedia.org/wiki/VSEPR.

[Yggdrasil]

What does your lewis structure look like?  What is the central atom?  How many atoms are bonded to the central atom?  How many lone pairs are on the central atom?

[pele]

the central atom is "S" 3 atoms are bonded to it. (one is double bond with "O")

[GreenHorn]

Well if there are 4 pairs of electrons (2 pairs on the double bond and 2 to the two chlorides)  the coordination number is 4, and thus the bond angle is 109 degrees? Correct me if im wrong...

[Yggdrasil]

the central atom is "S" 3 atoms are bonded to it. (one is double bond with "O")

Are there any lone pairs?

[pele]

If I understood correctly, than "S" has  2 alone electrons in the 3p orbital.

[Yggdrasil]

In SOCl₂ there is a lone pair (although it is not in a 3p orbital, remember that atomic orbitals become hybridized when atoms are bonded to each other).  So, there are three atoms bonded to the sulfur and a lone pair.  This defines four "electron domains" (called steric number on the wikipedia site) which means that there will be a tetrahedral geometry about the sulfur.  Since three of the four electron domains are bonds, this leads to a trigonal pyramidal shape.

For more descriptions of how geometries of molecules relates to the number of "electron domains" and number of bonds v. lone pairs, see the chart at http://en.wikipedia.org/wiki/VSEPR