Why do we use gold in Rutherford's `alpha` - particle scattering experiment ?

Rutherford's alpha-particle scattering experiment discovered

Thin layer of which metal was used in Rutherford's alpha particle scattering experiment.

What is the advantage of using gold rather than other metals in Rutherford's alpha particle scattering experiment ?

Which part of an atom was discovered by Rutherford's alpha particle scattering experiement ?

Rutherford's alpha particle scattering experiment led to the discovery of :

Explain the results of Rutherford alpha -particle scattering experiment.