Periodic Table · element

Thulium

Tm · Z 69

atomic number

69

atomic mass

168.93

notation

Tm

group

f-block: Lanthanide

period

6

state0c

Solid

state20c

Solid

density

9.32

melting pt

1550

boiling pt

1950

discovered

1879

abundance

0.52

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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.