Then why would they be ranked ? <| sep |> Deixar de ir numa manifestao porque o MBL vai estar l picuinha ideolgica . <| sep |> if by number of negative charge , you mean the dipole difference , then yes . The larger the difference , the stronger the ' dipole dipole ' charge is on the molecule . Also the charge does affect the molecules responses to others . This is the reason why oil doesn ' t dissolve in water , as oil is mostly made up of carbon and hydrogen chains , with Hydrogen again having a EN of 2 . 1 and carbon at 2 . 5 , the difference of 0 . 4 is low enough to call a nonpolar bond . That is , both the carbon and hydrogen tend to share electrons equally . As a result there aren ' t any dipoles tiny magnets within oil to attract water , and as a result the small repulsive forces between the substances is enough to prevent them from mixing . Of course if you add enough energy into the system , like mixing it really fast , or heating it , some small amounts of water will be able to be dissolved .