The orbital model was created by Neils Bohr, a student of Rutherford 's, developed a new model of the atom. He proposed that electrons are arranged in concentric circular orbits around the nucleus.
In this model, atoms had their mass and positive electric charge concentrated in a very small nucleus. ... The essential nature of the atomic nucleus was established with the discovery of the neutron by James Chadwick in 1932
Hope this helps!
