Electronegativity and polar bonds: S02

Slide 1

• POLARISATION
• Electronegativity is the ability to attract the bonding electrons in a covalent bond.
• Measured on thge pauling scale.
• A higher number means the element is better bale to attract the bonding electrons in the covalent bond.
• F is the most EN, but O, N, Cl are also Very strongly Electronegative.
• Polar and non-polar bonds.
• The covalent bonds in diatomic gases are non-polar because the EN/s are the same, so the electrons are equally attracted to both nuclei. Some elements lIke Carbon and Hydrogen have similar EN's, so bonds between them are essentially non polar.
• In a covalent bond between 2 atoms of Diff EN's, the bonding electrons are pulled towards the more EN atom. This makes the bond polar. The greater the difference in EN, the more polar the bond
• Ina covalent bond between 2 atom, the bonding electrons are pulled towards the mroe EN atom. This makes the bond polar. THe greater the difference in En's, the more polar the bond.
• In a covalent bond between 2 atoms of diff EN's, the bonding electrons will be pulled towards the more electronegative atom. This makes the boind bond polar. THe greater the differences in En's between the atoms, th emore polar the bond.
• In a covalent bond between 2 atoms of different En's, the bonding electrons are pulled towards the atom with the higher EN, and this makes the bond polar. higher diff in EN, more polar the bon.
• in a covalentbond between 2 atoms of diff En's. the bonding E-s will be pulled towards the atom with the higher En. This makes the bond polar. The greater the difference between teh En's, the more polar the bond.