How to do Electron Dot Configurations for compounds of elements

I understand and know how to do electron dot configurations for one element, but not for compounds of elements. this was my homework:

a) H2S H- :S: - H
b) CIF
c) PH3
i got the first answer from an example at school but i don't know how to do this

I'll be honest, I really hate these with the formatting problems on yahoo answers.

1. H2S, you know that S has 6 electrons around it and each H has 1 electron. Place the hydrogen with their 1 electron in the spots that S has missing. This gives S a -2 charge and each H a +1 charge.

2. Both Cl and F have 7 electrons. You should notice that they both are missing one, if you draw them together sharing their one electron each this will show the bonding. If you want, you can include a partial negative charge on the F and a partial positive charge on the Cl since F will have a stronger pull for the electrons (more electronegative than Cl).

3. Draw the 5 electrons around P (2 on top and 1 each on the 3 other sides). Place 1 hydrogen on each of the sides of P. This will give P a -3 charge and each H a +1 charge.

This would be so much easier drawing, but until there is a better formatting option here, my words and your imagination will have to do.

This should help.

http://www.youtube.com/watch?v=RJlEH5Jz8…

http://www.youtube.com/watch?v=JNPFR-22M…