3. Draw the atomic structure of a sulfur atom and a sulfide ion....explain why you draw it this way

An atom do not have charge and its outer most electron shell is not a full shell.
An ion is form when an atom gain or lose electron and form a full shell. ions have charges and can be classify under positive or negative ion. when it gives away electrons, it is a positive ion but when it gain electron, it is a negative charge. therefore, sulfur atom are drawn without charge and sulfide ion are drawn with a negative charge as it gain 2 electron.

Source: picture from Lim Jie En of 3E5