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(chemistry) a series of 15 radioactive elements with increasing atomic numbers from actinium to lawrencium

(chemistry) a series of 15 radioactive elements with increasing atomic numbers from actinium to lawrencium

(chemistry) a series of 15 radioactive elements with increasing atomic numbers from actinium to lawrencium

(chemistry) a series of 15 radioactive elements with increasing atomic numbers from actinium to lawrencium

(chemistry) a series of 15 radioactive elements with increasing atomic numbers from actinium to lawrencium