superheavy element
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English
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Noun
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
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.