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Question

If Pauli's exclusion principle was not known, the electronic configuration of Lithium atom would be:

A
1s2 2s1
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B
1s1 2s2
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C
1s3
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D
1s1 2s1 2p1
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Solution

The correct option is C 1s3
According to Pauli's exclusion principle, an orbital can accommodate a maximum of two electrons only. If this rule is violated that means we can have more than two electrons in an orbital.
Now, Li has the atomic number of 3 hence its electronic configuration would become 1s3.

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