Draw the Lewis electron dot structure for #SF_2#. How many lone pairs of electrons are on the central atom?

1 Answer
Mar 6, 2017

Answer:

#"There are 2 lone pairs on the central sulfur............"#

Explanation:

We have #2xx7+6# #"valence electrons"# to distribute.........each chlorine atom claims 7, and the sulfur atom claims 6.

snipview.com

Given that the central sulfur has 4 electron pairs surrounding it, 2 bonding, and 2 non-bonding, VESPER predicts that these are arranged in a tetrahedron to a first approx. The #/_F-S-F# #<109.5^@# given the sulfur lone-pairs compress the #/_F-S-F# bond angle.

This site reports that #/_F-S-F=98.3^@# which is compressed indeed (more so than in #OF_2#, where the corresponding #/_F-O-F=103^@#, an angle for which VESPER could account). Ask your inorganic prof to account for this compressed bond angle. If he (or she) answers you, post the account here.