Rutherford's alpha-particle scattering experiment was responsible for the discovery of

How did Rutherford prove that positively charged particles are present in the nucleus of an atom?

What were the drawbacks of Rutherford's model of an atom?

The presence of electrons outside the nucleus and the nucleus at the centre of the atom was suggested by:

Rutherford's $\alpha$-particle scattering experiment showed that:
$(i)$ electrons have negative charge
$(ii)$ the mass and positive charge of the atom is concentrated in the nucleus
$(iii)$ neutron exists in the nucleus
$(iv)$ most of the space in the atom is empty
Which of the above statements are correct?

Rutherford designed an experiment to determine the structure of an atom. Answer the following in relation to this experiment:
$(a)$ Name the element he selected for this purpose.
$(b)$ Which subatomic particle was used by him?
$(c)$ What was the drawback of Rutherford's model of the atom?