#3

Draw the atomic structure of a sulfur atom and a sulfide ion

explain why you draw it this way.

This is a picture of a sulfur atom.

As you can see, the configuration for it is 2.8.6! When added-up, the number of electrons is 16, equals to the number of protons. The picture is drawn that way because in the first shell, there should be only 2 electrons and 8 electrons in the second shell, However for the third shell, there are only 6 electrons left and so we say that there are 6 valence electrons in the 3rd shell.

And this, is the sulfide ion. 

and this, my friends is a Sulfide Ion. Sorry for the.... er, 'unique' drawing. I had a hard time drawing it using Windows Paint. BUT WOW, I made such an effort. Right, Mr Tan :P

*cough cough* but well, as show above; the configuration of the sulfide ion is (2.8.8) the third shell has GAINED 2 more electrons to achieve stability.

stability meaning that all respective shells have the perfect number of electrons it's supposed to contain and there's no extra or missing electrons.

 Because of this, the previous Sulfate atom becomes negatively charged and becomes a Sulfide ion.

The sulfide ion has gained 2 electrons and it now has a charge of -2.