89

Radioactive

Ac

Actinium

(227)

Actinide
Solid

Discovery

Debierne, André (1899)

Etymology

Greek

Meaning

Beam

Electron configuration

Electron configuration

Crystal structure

Crystal structure

Face-centered cubic

Physical Properties

Phase

  (at 21 °C and 101.325 kPa)

Solid

Melting point

  (at 101.325 kPa)

1050.0 °C

1323.15 K

Boiling point

  (at 101.325 kPa)

1737.0 °C

2010.15 K

Density

  (at 21 °C and 101.325 kPa)

10.07 g/cm3

Electronegativity

1.10