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Actinide

A chemical element with atomic number greater than 88; all are radioactive.

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Elements in the periodic table with atomic numbers from 90 to 103 (thorium to lawrencium); i.e., elements with a higher atomic number than actinium, which has an atomic number of ...

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Element with atomic number between 89 (Actinium) and 103

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Elements 89-102 are called actinides. Electrons added during the Aufbau construction of actinide atoms go into the 5f subshell. Actinides are unstable and undergo radioactive ...

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A chemical element with atomic number greater than 88; all are radioactive.

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The fifteen chemical elements that are between actinium (89) and lawrencium (103).

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A series of radioactive elements from actinium, atomic number 89, to and including lawrencium, atomic number 103.

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