In Rutherford’s model, most of the mass of the atom and all its positive
charge are concentrated in a tiny nucleus (typically one by ten thousand
the size of an atom), and the electrons revolve around it 4 Rutherford nuclear model has two main difficulties in explaining the
structure of atom: (a) It predicts that atoms are unstable because the
accelerated electrons revolving around the nucleus must spiral into
the nucleus This contradicts the stability of matter