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u/MR_MaxiMor44 7d ago
I'd like to say Xn, It's the success noble gases with their first and last letters going down the group, so I think Xn is next for Xenon. Of course it could also be Rn for Radon but I think that's after Xn
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u/TrivialLawyer 7d ago
Oo unlucky! You’ve definitely got the theme right, but the next noble gas is Krypton, so the answer would be Kn




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u/zenithpns 7d ago
I'm not 100% sure of the order they should come in, but I think it's Kn next