[SOLVED] Iron ions I am curious about the properties of iron ions fe2+ and fe3+. As they are accelerated in a mass spectrometer, which would travel faster and have the largest radius. I understand that they have lost electrons and have a marginal loss in mass, as well I understand that a positively charged ion will attempt to return to a neutral state. However how do I prove it with the following: m= qBr/2V, understanding that both B and r are squared. Any help would be great, thanks.