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     89    

89 Ac Actinium

Transition metal, mass: 227 u, no stable isotopes, abundance rank (earth/space): 86/?

Actinium 225 with a half-life of 10 days. Due to extreme radioactivity, the sample glows blue (Cherenkov radiation). Image © Copyright 2011 Los Alamos National Security, LLC All rights reserved.

Actinium 225

Actinium starts the series of actinoids (elements 90-103), which are named after this element. It naturally occurs from uranium decay, the half-life of its most stable isotope 227 is less than 22 years. It has very few applications, because it is difficult to handle and very dangerous. Chemically, it is similar to lanthanum. Most actinium decays to thorium, about 1.4% to francium.


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