Periodic Table · element

Thorium

Th · Z 90

atomic number

90

atomic mass

232.04

notation

Th

group

f-block: Actinide

period

7

state0c

Solid

state20c

Solid

density

11.7

melting pt

1750

boiling pt

4788

discovered

1829

abundance

9.6

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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.