1. Why Francium is the biggest element with the lowest IE and EN Francium has the lowest electronegativity since it has seven electron shells and its so big that the valence electron is far from the nucleus. The far away valence electron makes it easier for it to be removed. It is also the reason that it has low ionization energy.
2. Why Helium is the smallest element with the highest IE
Helium has the highest ionization energy because it has one valence shell and the protons of helium are close to the electrons. The two protons bring the electron closer.
3. Why Noble Gases don't have EN values
Noble Gases do not have any electronegativity values because it already has a full valence shell, or eight valence electrons. Since it has a full valence shell it does not attract any more electrons.
4. Why Fluorine has the highest EN
Fluorine has seven valence electrons and it needs one more. Since it is a small element its excellent at gaining or attracting electrons from other atoms.
