The symbol of the noble gas with 4 energy levels?
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Krypton (Kr)
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1 Helium (He)
2 Neon (Ne)10
3 Argon (Ar)18
4 Krypton (Kr)36
5 Xenon (Xe) 54
6 Radon (Rn) 86
7 Oganesson (Og) 118
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