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eka-actinium. In DICTIOUS you will not only get to know all the dictionary meanings for the word
eka-actinium, but we will also tell you about its etymology, its characteristics and you will know how to say
eka-actinium in singular and plural. Everything you need to know about the word
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English
Etymology
eka- + actinium
Noun
eka-actinium (uncountable)
- (chemistry) unbiunium (element 121)
- (chemistry) untriennium (dvi-lanthanum) (element 139)
Usage notes
This inconsistency, between referring to element 121 versus element 139, comes from the fact the elements beyond oganesson are not known, so it is unknown what element would be placed directly below actinium.