Answer and Explanation:
Bohr's model of the atom defined the electron as a particle that orbits around the nucleus in only certain orbital levels. As a result, it couldn't readily give account of the energy levels of larger elements with high atomic number.
The quantum model of the atom however, approaches the electron in an atom as not just a particle but a wave, with its distinct quantum number per energy level. It can therefore give the position and speed of an electron simultaneously at any energy level.
I hope this explanation is sufficient.