Ca2+ means that the charge on the ion is positive be two units. As electrons have a negative charge of -1, when an atom loses electrons, the overall charge increases. In F- one electron has been gained. Iron (III) is slightly different, it refers to the magnitude of the oxidation number rather than being a +3 charge
Answer:
Most likely 57%, I’m not 100% sure though. That’s just my best estimate right now.
