Assuming that the Pauli exclusion principle is non-existent, which of the following will be the most acceptable configuration of Li in the ground state?

1s² 2s¹

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1s³

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1s¹ 2s²

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1s¹ 2s¹ 2p¹

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Solution

The correct option is B
1s³

According to Pauli's exclusion principle, "No two electrons can have same set of four quantum numbers”.

This means,

"Only two electrons can exist in the same orbital and they will have opposite spin”.

But we are assuming that there is no such rule.

Therefore, all 3 electrons will try to go to lowest energy orbital, i.e., 1s

$\Rightarrow$ Li $\to$ 1 $s^{3}$

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Assuming that the Pauli exclusion principle is non-existent, which of the following will be the most unacceptable configuration of Li in the ground state?

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