1. any of the chemical elements with atomic numbers greater than that of actinium (89)
Usage: chemistry

1. relating to or being a chemical element with an atomic number greater than that of actinium
Usage: chemistry

Examples

• Scientists have discovered several transactinide elements in recent decades.
• The transactinide elements are all radioactive and have very short half-lives.
• Rutherfordium was one of the first transactinide elements to be synthesized.
• Research on transactinide chemistry requires sophisticated laboratory equipment.
• The transactinide region of the periodic table continues to expand as new elements are created.
• Many transactinide elements exist for only fractions of a second before decaying.