All chemical elements

Symbol

Tm

Atomic number

69

Chemical property

Lan­thanide

Origin o the name

Thule, the ancient name for Scandinavia

Period

6

Atomic weight (u)

168.93422

Atomic weight uncertainty (u)

0.00002

Density (g/cm³)

9.321

Melting point (K)

1818

Boiling point (K)

2223

Heat capacity (J/(g·K))

0.16

Electro-negativity

1.25

Abundance in earth's crust (mg/kg)

0.52