Sulfur. With the exception of the noble gases the general way to tell is that electronegativity increases as you move up and to the right on the periodic table. Fluorine is the most electronegative element the easiest way to compare electronegativities is to see which is closest to fluorine, in this case its sulfur. read more
Nitrogen has an electronegativity value of 3.04 and sulfur has a value of 2.58. If you don't know these values, you can also figure it out by looking at a periodic table. Fluorine (F) is the most electronegative element, and the closer the element is to it, the more electronegative it will be. read more