Wherever alpha particles struck the screen a flash of light is produced at that point on the screen, that the heavy body present in an atom must be occupying a very small volume, from these experiments Rutherford made the following observations , most of the particles that is 99.9 percent passed through the foil without undergoing any deflection , some particles were deflected through small angles , and a few were deflected through large angles very few only one in twelve thousand were deflected back that is through an angle greater than 90 degrees