(a)[4]
The results from the $\alpha$-particle scattering experiment provided evidence about atomic structure. State two results and the matching conclusions.
(b)[3]
For a spherical model of a copper atom of the isotope $^{63}_{29}\text{Cu}$, both the atom and its nucleus are assumed to be spherical. The nucleus has a diameter of $2.8 \times 10^{-14}\,\text{m}$. The atom has a diameter of $2.3 \times 10^{-10}\,\text{m}$. Calculate the ratio $\dfrac{\text{density of the nucleus}}{\text{density of the atom}}$.