transactinoid element
Quick Summary
The term "transactinoid element" refers to chemical elements with atomic numbers greater than 103, placing them beyond the actinoid series in the periodic table. These elements are all unstable and undergo radioactive decay, with half-lives ranging from millions of years to fractions of a second.1
Only a few transuranium elements, including neptunium and plutonium, occur naturally in trace amounts. The majority of transuranium elements, including all transactinoids, are synthesized through nuclear reactions in reactors or particle accelerators.21
Research into these heavy elements expands our understanding of matter's fundamental structure and allows for predictions about even heavier, undiscovered elements. Chemical properties of transactinoids are studied using specialized techniques, though relativistic effects can influence predicted behaviors.134
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