单词 | lawrencium |
释义 | law·ren·ci·um ![]() n. Symbol Lr A synthetic, radioactive metallic element of the actinide series that is produced by bombarding californium with boron ions. The most stable confirmed isotope is Lr-262 with a half-life of approximately 4 hours; atomic number 103. See Periodic Table. [After Ernest Orlando Lawrence.] |
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