Which of the following explains the sequence of filling the electrons in different shells [AIIMS 1998; BHU 1999]

Which of the following explains the sequence of filling the electrons

1.	Which of the following explains the sequence of filling the electrons in different shells [AIIMS 1998; BHU 1999]
A.	Hund's rule
B.	Octet rule
C.	Aufbau principle
D.	All of these
Answer» D. All of these

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Which of the following explains the sequence of filling the electrons in different shells [AIIMS 1998; BHU 1999]

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