<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>
<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>
what is the most electronegative atom on the periodic table
what is the most electronegative atom on the periodic table
fluorine
fluorine