For example, if I replace this x with a chloride atom, so this is a chloride. That means the chloride, since the chloride is more electronegative than either the carbon or the H atoms, that means that chloride will pull electrons more strongly than either of the H atom. And so there will be an unequal electron density in this bond. Electrons will be closer to this x atom, to this CL atom than to the carbon atom. And that means that this will be a slightly asymmetrical molecule, asymmetrical compound. And so it will slightly deviate from this methane compound.