Actinide
Actinide
Actinide (pronounced: /ˈæk.tɪ.naɪd/) is a series of chemical elements in the periodic table. They are part of the f-block, and are the 15 metallic chemical elements with atomic numbers from 89 to 103, actinium through lawrencium.
Etymology
The term "actinide" was derived from the first element in the series, actinium. The suffix "-ide" is used to denote that the element is a member of a certain group of elements.
Description
The actinide series derives its name from the first element in the series, actinium. The informal chemical symbol An is used in general discussions of actinide chemistry to refer to any actinide. All but one of the actinides are f-block elements, corresponding to the filling of the 5f electron shell; lawrencium, a d-block element, is also generally considered an actinide. In comparison with the lanthanides, also mostly f-block elements, the actinides show much more variable valence.
Related Terms
- Actinium: The first element in the actinide series.
- Lanthanides: A group of chemical elements that are often compared with the actinides.
- Periodic Table: A tabular arrangement of the chemical elements, in which the actinides are a part.
- Valence (chemistry): A measure of an element's combining power with other atoms when it forms chemical compounds or molecules.
See Also
External links
- Medical encyclopedia article on Actinide
- Wikipedia's article - Actinide
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