Question

How to obtain term symbols for an excited electronic configuration?

Answer 1

I have trouble writing down the term symbols for the first excited state of Neon,  1s22s22p53s1 1s22s22p53s1. I thought it would be  3P2 3P2, but the correct answer is  1P1 1P1 and I cannot understand why.

Answer 2

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✔️✔️For an atom in the configuration 

1s22s2p2,

only the two p‐electrons matter. For an atom in the configuration

 1s22s12p1,

we have to examine the 2s and 2p electrons. Atoms have quantum numbers that are directly analogous to the electronic quantum numbers.

L=|l1+l2|,|l1+l2‐1|,…,|l1‐l2|

1s22s22p53s1 1s22s22p53s1.


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