Answer:
Option A, Electrons in Bohr's model are placed in orbits of different energy levels.
Explanation:
Bohr’s atomic model gave the concept of discrete energy levels with in an atom while no such concept was outlined by Rutherford. Thus, option A is correct.
While other options are incorrect because of following reasons –
Option B- Both Bohr and Rutherford model proposed existence of dense core of atom which majorly constitutes the mass of atom.
Option C - Both Bohr and Rutherford model proposed existence of electron which revolve around the central mass of atom
Option D – This concept was proposed neither in Bohr nor in Rutherford atomic model
