question_answer

In a given atom no two electrons can have the same values of all the quantum numbers. This is called

A)  Hund's rule

B)  Aufbau principle

C)  Uncertainty principle

D)  Pauli's exclusion principle

Correct Answer: D

Solution :

According to Pauli's principal, "No two electrons with in the same atom can have the same values for all the four quantum numbers". No two electrons can have same position and energy in an atom. If two electrons in an atom have same value of n,( and m, the value of their spin quantum number(s) will be different. Thus, if one electron has  value, the other electron will have  value.