look at this link on electronegativity trends. Notice how these trends sometimes fall down, e.g. the value for F(g) is lower than the trend would suggest. Can you think why this is so?
Electron Affinity Trends
Note: This is not the same as electronegativity. Electronegativity values relate to the ability of an atom within a covalent bond to pull the bonding electrons towards itself. A significant difference in electronegativity values leads to a polar bond. This may or may not lead to a polar molecule, depending if the dipoles cancel due to symmetry in the molecule. If they cancel the molecule will be overall non polar, if they don't it will be polar.
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