<P> On the most basic level, electronegativity is determined by factors like the nuclear charge (the more protons an atom has, the more "pull" it will have on electrons) and the number / location of other electrons present in the atomic shells (the more electrons an atom has, the farther from the nucleus the valence electrons will be, and as a result the less positive charge they will experience--both because of their increased distance from the nucleus, and because the other electrons in the lower energy core orbitals will act to shield the valence electrons from the positively charged nucleus). </P> <P> The opposite of electronegativity is electropositivity: a measure of an element's ability to donate electrons . </P> <P> Caesium is the least electronegative element in the periodic table (= 0.79), while fluorine is most electronegative (= 3.98). Francium and caesium were originally both assigned 0.7; caesium's value was later refined to 0.79, but no experimental data allows a similar refinement for francium . However, francium's ionization energy is known to be slightly higher than caesium's, in accordance with the relativistic stabilization of the 7s orbital, and this in turn implies that francium is in fact more electronegative than caesium . </P> <Ul> <Li> </Li> <Li> </Li> <Li> </Li> </Ul>

What is the most electronegative atom on the periodic table