That mostly depends on the molecule. Simple molecules such as H2O (water) have one oxygen that is connected to two hydrogen atoms building a molecule of water that has two covalent bonds. However, organic compounds have significantly more complex molecules that consist of a large number of different chemicals.
SiF4 is a nonpolar molecule because the fluorine's are arranged around the central silicon atom in a tetrahedral molecule with all of the regions of negative charge cancelling each other out.
