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Pronunciation varies by accent · noun
(chemistry) Any of the undiscovered chemical elements from unbiunium (121) to perhaps unpentseptium (157), following the transactinides. These will presumably go below the actinides in the periodic table..
Use superactinide when its meaning, tone and grammar fit the full sentence. A synonym is not always a direct replacement.
Superactinide means (chemistry) Any of the undiscovered chemical elements from unbiunium (121) to perhaps unpentseptium (157), following the transactinides. These will presumably go below the actinides in the periodic table..
The closest synonym depends on the sentence and intended sense.
The opposite depends on the specific sense.
Use superactinide where its definition matches the intended context.
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