Which of the following is responsible to rule out the existence of definite paths or trajectories of electrons?
(a) Pauli's exclusion principle
(b) Heisenberg's uncertainty principle
(c) Hund's rule of maximum multiplicity
(d) Aufbau principle
The answer is the option (b)
Heisenberg's uncertainty principle, which states that it is not possible to simultaneously determine the velocity and position of an electron correctly.