4. The orbit is Rutherford's model …

• Rutherford  postulated  that  the  atom  must  contain  large  empty  spaces  as  most  of  the  α-particles passed through it without getting deflected. Some α-particles were deflected by the foil through small angles, while some were deflected through very large angles. Thus, Rutherford concluded that the positively charged particles in an atom must be concentrated in a very small space.
• Rutherford's Atomic Model:

Based on the results of the α-particle scattering experiments, Rutherford put forth his atomic model. An  atom  contains  a  positively  charged  centre  called the nucleus  of  the  atom.  Almost  all  the  mass  of the atom is concentrated in the nucleus. The electrons of the atom revolve around the nucleus in fixed, circular orbits. The  size  of  the  nucleus  is  many  times  smaller  than  the  size  of  the  atom.  The  nucleus  of  an  atom  is 10,000 times smaller than the atom.