I attached an electronegativity chart to the links. Generally the electronegativities increase as you go farther right and up (towards the lowest atomic weight noble gas Helium) with the highest electronegativity actually fluorine. So basically the lower atomic numbered non-metals of carbon, nitrogen, oxygen, and the halogens. Surprisingly, the heavier transition metals also have relatively high electronegativites campared to lighter metals.
Fluorine is the most electronegative element. The ones in that upper corner are all more electronegative than ones on the opposite side of the table. Fluorine is assigned an electronegative value of 4.0. Cesium and Francium are the least electronegative elements, with values of .7.
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