A) Paults exclusion principle
B) Hunds rule
C) Aufbau principle
D) \[n+l\] rule
Correct Answer: A
Solution :
Pauls exclusion principle states that no two electrons in an atom can have the same set of all the four quantum numbers. Aufbau principle: It states that electrons are added progressively to the various orbitals in their order of increasing energy starting with the orbitals of lowest energy. Hunds rule: It states that electron pairing in any orbital \[(s,\,\,p,\,\,d,\,\,f)\] cannot take place until each orbital of the same sub-level contain 1-electron.
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