Hi, can someone explain why a polar molecule must fulfill the condition of having asymmetry about the central atom, and not just the condition of different atoms having different electronegativities? I mean, IF a water molecule was linear, wouldn't the O atom in the centre still have a negative dipole, and the two H atoms still have positive dipoles, so shouldn't it still be able to act as a polar solvent and do stuff like solvate ionic compounds? Thanks!