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Electrons occupy the available sub-level...

Electrons occupy the available sub-level which has lower n+l value. This is called:

A

Hund's rule

B

Aufbau principle

C

Heisenberg's uncertainty principle

D

Pauli's principle

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The correct Answer is:
B
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MBD PUBLICATION-STRUCTURE OF ATOM-QUESTION TYPE
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  11. Size of the nucleus is:

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