atomic number 89


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Noun1.atomic number 89 - a radioactive element of the actinide seriesatomic number 89 - a radioactive element of the actinide series; found in uranium ores
chemical element, element - any of the more than 100 known substances (of which 92 occur naturally) that cannot be separated into simpler substances and that singly or in combination constitute all matter
uranium ore - any ore from which uranium can be extracted