lawrencium

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lawrencium (symbol Lr) Radioactive metallic element, one of the actinide series. It was first made in 1961 at the University of California at Berkeley by bombarding californium with boron nuclei. It is named after the US physicist Ernest Lawrence who established the laboratory where it was produced. Properties: at.no. 103; r.a.m. 262; most stable isotope Lr256 (half-life 27 seconds).

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