If B is a lot more electronegative than A, then the electron pair is dragged right over to B's end of the bond. The hydrogen-chlorine bond in HCl or the hydrogen-oxygen bonds in water are typical. In the diagram, "\(\delta\)" (read as "delta") means "slightly" - so \(\delta \) means "slightly positive".Ī polar bond is a covalent bond in which there is a separation of charge between one end and the other - in other words in which one end is slightly positive and the other slightly negative. At the same time, the A end (rather short of electrons) becomes slightly positive. That means that the B end of the bond has more than its fair share of electron density and so becomes slightly negative. What if B is slightly more electronegative than A?ī will attract the electron pair rather more than A does. Fluorine (the most electronegative element) is assigned a value of 4.0, and values range down to cesium and francium which are the least electronegative at 0.7. The Pauling scale is the most commonly used.
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