Lewis structures

me2gud4u

hey, been doing these questions for a while now and certain ones I'm fnding really hard,
can anyone tell me how I would draw the lewis structure for these following compunds, with lone pairs and electrons the works drawn in.

H3SnF
CH3PCl2
H2SnF
S2Cl2
HSnCl3
BrF....................is it just Br-F , with three set lone pairs on Br and likewise for F?
SeCl4
HSiF3.............is silicon in the middle of what looks like a tetrahedral structure with three flourines coming out of one side and the top of the structure a H?Then three lone pairs on each F?
P4 (Not sure about this at all)
SCl2 (think i may have this one)
H2SnF2
H2SiF2

I would be so grateful if anyone would take the time to explain these structures briefly, as it would give me a pass alone if i can answer this question perfectly in the exam. Thanks.

SOL

You are right for BrF and HSiF3

P4 each P needs 3 bonds, and there are 4 of them so you get a tetrahedron right?

SCl2, it just like say OF2
Since Tin and silicon are in the same group you can expect the same lewis structure, a terahedron...

At least I think so

ZorbaTehZ

Yup, P4 is tetrahedral.
H3SnF, Sn 4 valence electrons, so that should be pyrimidal.
CH3PCl2, well that's going to have a strange shape no idea what its called.
H2SnF, like above except there's a lone pair on Sn, so it would be pyrimidal too i think.
I've got a test in this too next week(!), such an easy question once you get the hang of them.

me2gud4u

thanks a million folks.............thank god i'll be done with this stuff next week!!might have dossed a bit too much this yr!

SOL

trigonal bipyramidal.... 5 points, a top a bottom, and three around the middle, that is assuming it is (CH3)3PCl2