I did a separation of Bromide and Iodide ions using paper chromatography technique for 0.3% solutions of Bromide and Iodide of sodium. I got the Retention factor equal to ~0.71 for Iodide and ~0.47 for Bromide.
So, I want to ask if ion size is playing any role in deciding this retention factor? Or, is there some another perspective that I am missing here? Specifically, what is the reason for this difference?