We can get evidence on the diameter of an atom from electrolysis and X-ray diffraction experiments. We can get evidence on the size of the nucleus from Rutherford's scattering experiments. Suppose that the diameter of an atom of gold is about 5.0 x 10-10 m and the diameter of the nucleus is about 8.4 x 10-14 m. If a student is making a scale model of the gold atom and makes the nucleus a BB of diameter 1.0 mm, then what diameter will the model have to be in order to represent the diameter of the atom? (6.0 m)