How was it shown that the atom has empty space?

On the basis of Rutherford's model of an atom, which subatomic particle is present in the nucleus of an atom?

State one major drawback of Rutherford's model.

(a) Which metal did Rutherford select for his α-particle scattering experiment and why ?

(b) What do you think would be the observation of α-particle scattering experiment if carried out on

(i) heavy nucleus like platinum

(ii) light nuclei like lithium.