Rutherford's alpha particle experiment showed that the atoms have?

Rutherford’s alpha particle experiment showed that at the centre of an atom there is a tiny positively charged particle called ‘Nucleus’. The nucleus has all the mass of an atom. The nucleus is consisting of proton and neutron. The amount of positive charge at the nucleus is equal to the total amount of negative charges on all the electrons of an atom and all the electrons revolve around the nucleus.