Electronegativity is the measure of the attraction of an atom from the electron in a chemical bond. The higher electronegativity of an atom , the greater attraction for bonding electron. Electronegativity is related to ionization energy.
- Electrons with low ionization energy have low electronegativity . Because their nuclei do not exert a strong attractive force on electrons.
- Electrons with high ionization energies have high electronegativity due to the strong pill exerted on electrons by the nucleus.
In a group the electronegativity decreases as atomic number increases. As a result increase distance between the valence electron and nucleus. ( greater atomic radius )
- Electropositive (ie: low electronegativity) element is cesium.
- High elecgtronegativity element is fluorine.