Then the incoming a-particle could get
very close to the positive charge without
penetrating it, and such a close
encounter would result in a large
deflection This agreement supported
the hypothesis of the nuclear atom This
is why Rutherford is credited with the
discovery of the nucleus In Rutherford’s nuclear model of
the atom, the entire positive charge and
most of the mass of the atom are
concentrated in the nucleus with the
electrons some distance away