Periodic Table · element

Astatine

At · Z 85

atomic number

85

atomic mass

210

notation

At

group

17: Fluorine

period

6

state0c

Solid

state20c

Solid

occurrence

From Decay

melting pt

302

boiling pt

337

discovered

1940

abundance

3e-20

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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.