Definition: Actinium is the name for the element with atomic number 89 and is represented by the symbol Ac.
It is a member of the actinide group.
It is a member of the actinide group.
Actinium Definition
By Anne Marie Helmenstine, Ph.D., About.com Guide
This is a picture of pure actinium, which is a metal.
Murray RobertsonChemistry Glossary and Dictionary
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