81

Tl

Thallium

204.38

Basic Metal
Solid

Discovery

Crookes, William (1861)

Etymology

Greek

Meaning

Green twig

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)

303.0 °C

576.15 K

Boiling point

  (at 101.325 kPa)

357.0 °C

630.15 K

Density

  (at 21 °C and 101.325 kPa)

11.85 g/cm3

Electronegativity

1.62