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Words related to actinide

ac·ti·nide
A a

  • transactinide element

    any element having an atomic number higher than 103, the last of the actinide series. These superheavy, radioactive elements are extremely short-lived, and can only be created in the laboratory.

  • actinide series

    a series of 15 radioactive elements with increasing atomic numbers from actinium to lawrencium
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