The electrons should be filled in energy sub shells in order of increasing energy values is the principle of

The electrons should be filled in energy sub shells in order of increa

1.	The electrons should be filled in energy sub shells in order of increasing energy values is the principle of
A.	Aufbau
B.	Pauli's exclusion
C.	Hund's
D.	none
Answer» B. Pauli's exclusion