superheavy element
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English
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Noun
[edit]superheavy element (plural superheavy elements)
- A chemical element with an extremely high atomic number; typically taken to mean beyond lawrencium (element 103, the last actinide)
Usage notes
[edit]There is some dispute as to how high an element's atomic number has to be before it counts as 'superheavy'; the usual criterion is anything beyond lawrencium: in other words, any transactinide.