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Lr |
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Lr, symbol for the element lawrencium lawrencium, artificially produced radioactive chemical element; symbol Lr; at. no. 103; mass number of most stable isotope 262; m.p. about 1,627°C;; b.p. and sp. gr. unknown; valence +3. ..... Click the link for more information. . LRSee low radiation. Lr (chemistry)
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