- ChemGlobe – Actinium
- Overview of the featured element’s therma, steric and electronic details. Includes numerical information.
- Chemical Elements.com: Actinium
- Introduction to the structure of the element’s atom, isotope facts as well as its characteristics and discovery.
- Environmental Chemistry.com: Actinium
- Archived data on industrial implications, applications, electronic configuration, composition and regulations imposed on the element usage.
- Jefferson Lab
- Cites the discovery and applications of the element. Contains physical data and configuration of its electronic structure.
- LANL: Actinium
- Numerical data on the element’s structure and properties presented. Features links to information resources.
- Lenntech – Actinium
- Profiles the application and environmental effects of the element with atomic data provided.
- Visual Elements – Actinium
- Presents brief description of the element’s characteristics, origin and discovery.
- WebElements – Actinium
- Defines the structure of the element including details on its atomic characteristics. Cites related references as well.
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