III.Electron Affinity The electron affinity is the energy change that occurs when an electron is added to a gaseous atom B(g)+e今B(g)+A Electron affinity usually increases as the radii of atoms decrease Electron affinity decreases from the top to the bottom of the periodic table IV.The Electronegativity Electronegativity was proposed by Pauling to evaluate the comparative attraction of the bonding electrons by the atoms. It can be concluded that: 1. The electronegativities of metals are small while those of non-metal are large. 2. Generally,the electronegativity increases from left to right across the periodic table but it decrease from top to bottom within a group. 3. Elements with great difference in electronegativities tend to form ionic bonds.III. Electron Affinity The electron affinity is the energy change that occurs when an electron is added to a gaseous atom . B(g) + e- Æ B- (g)+A • Electron affinity usually increases as the radii of atoms decrease. • Electron affinity decreases from the top to the bottom of the periodic table. IV. The Electronegativity • Electronegativity was proposed by Pauling to evaluate the comparative attraction of the bonding electrons by the atoms. It can be concluded that: 1. The electronegativities of metals are small while those of non-metal are large. 2. Generally, the electronegativity increases from left to right across the periodic table but it decrease from top to bottom within a group. 3. Elements with great difference in electronegativities tend to form ionic bonds