In the present research work, we tableted the ratio of Mott to Rutherford cross section ( ), for Iron and Silver atoms by employing Mckinley - Fashbach equation , in the range of incident electron energy (50KeV-10MeV), by adopting the equations used in the presen calculations by using Visual Basic 2010. The results shows that the ratio ( is mostly influenced with two parameters :incident electron energy and atomic number of the target material on the Mott cross section. The obtained results were compared with previous results, and they shows a good agreement, and his confirms the validity of the equations used in the employed energy range.