1.

In a given atom no two electrons can have the same values for all the four quantum numbers. This is called [BHU 1979; AMU 1983; EAMCET 1980, 83; MADT Bihar 1980; CPMT 1986, 90, 92; NCERT 1978, 84; RPMT 1997; CBSE PMT 1991; MP PET 1986, 99]

A.                 Hund's rule
B.                 Aufbau's principle
C.                 Uncertainty principle
D.                 Pauli's exclusion principle
Answer» E.


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