Actinide chemistry (or actinoid
chemistry) is one of the main branches of nuclear chemistry that investigates
the processes and molecular systems of the actinides. The actinides derive
their name from the group 3 element 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. The actinide series
encompasses the 15 metallic chemical elements with atomic numbers from 89 to
103, actinium through lawrencium.
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