radon angolul

radon▼◼◼◼noun
[UK: ˈreɪ.dɒn] [US: ˈreɪ.ˌdɑːn]Helium, neon, argon, krypton, xenon and radon are noble gases. = Helium, Neon, Argon, Krypton, Xenon und Radon sind Edelgase.