Actinium, Ac, is a radioactive transition metal element,
Group IIIa of the periodic table.
It is the first member of the actinide series of inner transition elements.
- Atomic Number : 89
- Relative Atomic Mass : 227 (approximately)
- Melting Point : 1050 degC
- Relative Density : 10.
It has three
: 10 days
Actinium 227, which has a half-life of 22 years, is formed
by the irradiation of Radium.
Actinium, Ac, was discovered by Andre Debierne in 1899 AD.
Actinium occurs in association with Uranium ores, as a decay product
Actinium is used as a source of Neutrons.
Start of Hypertext ....
Hypertext Copyright (c) 2000 Donal O'Leary. All Rights Reserved.