What are Actinides of Actinoids Below is a list of elements that are in the actinides or actinoid group of elements on the periodic table.They are a subset of the rare earth elements group. The series encompasses the chemical elements with atomic numbers from 90 to 103, thorium to lawrencium. Like the lanthanides, all actinides are highly reactive with halogens and chalcogens; however, actinides react more easily. Actinides, especially those with a small number of 5f-electrons, are prone to hybridization.
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