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A radioactive actinide discovered in 1961. It has the atomic symbol Lr, and atomic number 103. There are twelve isotopes with mass numbers 252–262 and 266.

Year introduced: 1975

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Tree Number(s): D01., D01.268.556.423, D01.268.956.295, D01.496.749.305.100.500, D01.552.020.507, D01.552.544.423

MeSH Unique ID: D007852

Registry Number: QRT37X99RQ

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