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{{Element | name=Actinium | symbol=Ac | anumber=89 | amass=227.0 amu | noe=89 | class=Transition Metal | cstructure=Cubic | color=Silver | date=1899 | discname=André-Louis Debierne | origname=From the Greek ''aktinos''. | uses=Unknown | obtained=Synthesized in labs, as it is extremely rare. }} The actinide series of elements, which have atomic weights between actinium and lawrencium.

{{Element | name=Actinium | symbol=Ac | anumber=89 | amass=227.0 amu | noe=89 | class=Transition Metal | cstructure=Cubic | color=Silver | date=1899 | discname=André-Louis Debierne | origname=From the Greek ''aktinos''. | uses=Unknown | obtained=Unknown, as it is extremely rare. }}

'''Actinium''' is a very rare [[radioactive]] chemical [[element]]. It is silvery-white and glows blue in the dark. <ref>[[Encylopaedia Britannica]] online, [http://www.britannica.com/eb/article-9003601/actinium ''Actinium'']</ref>

'''Actinium''' is a very rare [[radioactive]] chemical [[element]]. It is silvery-white and glows blue in the dark. <ref>[[Encylopaedia Britannica]] online, [http://www.britannica.com/eb/article-9003601/actinium ''Actinium'']</ref>