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If Pauli's exclusion principle is not kn...

If Pauli's exclusion principle is not known, the electronic arrangement of lithium atom is

A

`1s^(2)2s^(1)`

B

`1s^(1)2s^(2)`

C

`1s^(3)`

D

`1s^(2)2s^(1)2p^(1)`

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The correct Answer is:
C
Following flulbau rule
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