Transactinide element

In chemistry, transactinide elements are the chemical elements with atomic numbers greater than 103, the atomic number of lawrencium. They are also called super-heavy elements.

Related Topics:
Chemistry - Chemical element - Atomic number - Lawrencium

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All transactinide elements are also transuranium elements, that is, have an atomic number greater than that of uranium. The further distinction of having a greater atomic number than the actinides is significant in several ways:

Related Topics:
Transuranium elements - Uranium

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• The transactinide elements all have electrons in the 6d subshell in their ground state (and thus are placed in the d-block), although lawrencium also has one electron in the 6d subshell.
• The Element naming controversy involved the first five or six transactinide elements. These elements thus used three-letter systematic names for many years.
• Except for dubnium, even the longest-lasting isotopes of transactinide elements have extremely short half-lives, measured in seconds, or smaller units.

All of the transactinide elements are radioactive and have only been obtained synthetically in the laboratory. None of these elements has ever been collected in a macroscopic sample. Transactinide elements are all named after either nuclear physicists or important locations involved in the synthesis of the elements.

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The term transactinide is an adjective, and is not commonly used alone as a noun to refer to the transactinide elements.

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Transactinide element: List of the transactinide elements: ►