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/tɛkˈni.ʃi.əm/ · noun
A metallic chemical element (symbol Tc) with an atomic number of 43..
Use technetium 99 when its meaning, tone and grammar fit the full sentence. A synonym is not always a direct replacement.
Technetium 99 means A metallic chemical element (symbol Tc) with an atomic number of 43..
Common synonyms include eka-manganese, ekamanganese, masurium, atomic number 43.
The opposite depends on the specific sense.
Use technetium 99 where its definition matches the intended context.
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