Superactinide

Noun

Definitions

1.NounAny 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.

Synonyms

actinide transactinide actinoid eka-actinium organoactinide actinate eka-protactinium nihonium actineon acton exactinio actinon

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