Ac

Actinium

Z 89 227.0 g/molActinide Radioactive

Overview Atomic Properties Thermodynamics Electromagnetism Isotopes

Group

3

Period

7

Block

f

Occurrence

From decay

Biological Role

---

History

1899 (discovery)

André-Louis Debierne

1955 (isolation)

Joseph G. Stites, Murrell L. Salutsky, Bob D. Stone

Named By

André-Louis Debierne

Latin Name

Actinium

Abundance

Solar System

x

Sun

x

Meteorites

x

Earth's crust

x

Oceans

x

Humans

x