69

Tm

Thulium

168.93

Lathanide
Solid

Discovery

Cleve, Per Teodor (1879)

Etymology

Greek

Meaning

A mythical country

Electron configuration

Electron configuration

Crystal structure

Crystal structure

Hexagonal close-packed

Physical Properties

Phase

  (at 21 °C and 101.325 kPa)

Solid

Melting point

  (at 101.325 kPa)

1545.0 °C

1818.15 K

Boiling point

  (at 101.325 kPa)

2510.0 °C

2783.15 K

Density

  (at 21 °C and 101.325 kPa)

9.32 g/cm3

Electronegativity

1.25