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einsteinium


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transuranic elements

actinoid

Albert Einstein (1879—1955) German-born American theoretical physicist

actinide

 

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Symbol Es. A radioactive metallic transuranic element belonging to the actinoids; a.n. 99; mass number of the most stable isotope 254 (half-life 270 days). Eleven isotopes are known. The element was first identified by A. Ghiorso and associates in debris from the first hydrogen bomb explosion in 1952. Microgram quantities of the element did not become available until 1961.

Subjects: Chemistry — Physics.


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