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Pronunciation varies by accent · noun
(dated) A chemical element, supposed to be the then-undiscovered technetium, but later identified as rhenium..
Element between molybdenum and ruthenium (perhaps Ogawa's nipponium)
Tiede at Berlin University told Toshiyuki Majima that nipponium might be rhenium when the latter visited him in 1938.
Use nipponium when its meaning, tone and grammar fit the full sentence. A synonym is not always a direct replacement.
Nipponium means (dated) A chemical element, supposed to be the then-undiscovered technetium, but later identified as rhenium..
The closest synonym depends on the sentence and intended sense.
The opposite depends on the specific sense.
Element between molybdenum and ruthenium (perhaps Ogawa's nipponium)
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