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Created page with "== Introduction == The actinide series comprises the 15 metallic chemical elements with atomic numbers from 89 to 103, actinium through lawrencium. The series is named after actinium, the first element in the series, which is often included in the actinide series, although its placement is not always consistent. == Characteristics == The actinide series is characterized by its members' large atomic and ionic sizes, complex crystal structures, and hig..."