Question

Are the elements having high negative electron gain enthalpy more electronegative?

Answer 1

the elements having high negative electron gain enthalpy will be more electronegative but it also depends on

1) Nuclear charge. The higher the nuclear charge, more will be the electronegativity value of an element, since the nucleus will be able to attract or pull more electrons towards itself.

2)Atomic size

3)Screening effect or shielding effect.

For eg. In case of Cl and Fl

Although fluorine is most electronegative element but chlorine has more electron gain enthalpy.

This is because of the small size of the fluorine so addition of electron is not favorable process because repulsion between the electrons takes place.