Actinoid

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The actinide or actinoid (IUPAC nomenclature) series encompasses the 15 chemical elements with atomic numbers from 89 to 103, actinium to lawrencium.[2] The actinide series derives its name from the group 3 element actinium; although actinoid (actinide) means "actinium-like" and therefore should exclude actinium, it is usually included in the series for the purpose of comparison.[3] Only thorium and uranium occur in more than trace quantities in nature; the other actinides are synthetic elements.[4] The actinides are usually considered to be f-block elements; they show much more variable valence than the lanthanides. All actinides are radioactive and release energy upon radioactive decay; uranium and plutonium, the most abundant actinides on Earth, are used in nuclear reactors and nuclear weapons.

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