What is the correct exited state configuration of litium?

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SUMMARY

The correct exited state configuration of lithium is 1s²2p¹. This conclusion is based on the understanding that while hydrogen's wave function depends on three quantum numbers, lithium's configuration requires consideration of electron screening and Hund's rule, which indicates that s and p orbitals have different energy levels. The energy expression for lithium is given by En,l = -13.6 eV/(n - Δl)², which reflects the adjustments needed for multi-electron systems.

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Petar Mali
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Litium has a structure

[tex]1s^22s^1[/tex]

What is the first exited state of litium?


I have some doubt? I think that it is

[tex]1s^22p^1[/tex]

Is it correct or maybe

[tex]1s^23p^1[/tex]

Why I'm in problem. Because wave function of hydrogen atom depends of three quantum numbers
[tex]\psi_{n,l,m}[/tex] but energy depends only of one quantum number [tex]E_n[/tex]. So we have degeneration. In this logic it's need to be [tex]1s^23p^1[/tex]. But I don't have hydrogen I have litium, so must be some ecranisation and of course Hund rule [tex]s[/tex] and [tex]p[/tex] orbitals have different energy. And I can say that

[tex]E_{n,l}=-13,6eV\frac{1}{(n-\Delta l)^2}[/tex]

Thanks for your answer!
 
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