Periodic Table · element

Radon

Rn · Z 86

atomic number

86

atomic mass

222

notation

Rn

group

18: Helium/Neon

period

6

state0c

Gas

state20c

Gas

occurrence

From Decay

density

0.00973

melting pt

-71

boiling pt

-61.7

discovered

1899

abundance

4e-13

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From the All Periodical Elements database in Notion, last edited 2026-08-15. This page is the row, rendered by the build; nothing on it is written by hand.