Skip to content
Nut & Shell GamesDE
Action-Actum — Actinium

Monster name: Action-Actum

Actinium

Atomic number
89
Symbol
Ac
Series
transition metals
Group
3
Period
7
State of matter
solid
  • radioactive

The name actinium comes from the greek word aktis meaning "ray", because it generates radioactive rays and glows in the dark. It is name patron for a whole group of elements: the actinides. Because of its strong radioactivity there are only a few very special applications for it.

Actinium medical radioisotope held in a v-vial. The blue glow comes from the ionization of surrounding air by alpha particles.
Actinium medical radioisotope held in a v-vial. The blue glow comes from the ionization of surrounding air by alpha particles. — Image source: Wikimedia Commons