Energy Levels of Neutral Carbon by National Institute of Standards and Technology
= Energy Levels of Neutral Carbon by National Institute of Standards and Technology
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https://physics.nist.gov/PhysRefData/Handbook/Tables/carbontable5.htm[Neutral-carbon level table]
The NIST table identifies the2s²2p² ground configuration with³P₀ lowest and lists its³P,¹D and¹S levels. This is atomic reference data, not a worked examination answer set.