Thin layer chromatography

Describe the difference between the stationary phase and the mobile I Why is it important not to use a pen when writing on the TLC plate? Is it possible for the retention factor to be greater than one? Why or W The solvent mixture that you used for this experiment was polar in nat a non-polar solvent such as hexane were used for the mobile phase? Based on the Rf values of the five compounds used in this experiment increasing polarity. How will the retention factor be affected if the procedure is NOT stopp the plate?