Tuesday, January 29, 2013


                 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 )

Example :
  • Electropositive (ie: low electronegativity) element is cesium.
  • High elecgtronegativity element is fluorine.

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