Note: In the foll

Assertion (A) It is impossible to determine the exact position and exact momentum of an electron simultaneously is the statement of Heisenberg’s uncertainty principle which is mathematically expressed as :

And that is why a clear definite path or trajectory of an electron cannot be predicted accurately and therefore gives rise to the concept of probability of finding the electron in a certain region (probability density).

Hence, Reason (R): The path of an electron in an atom is clearly defined. Is a false statement and therefore cannot justify (A).