103
Lawrencium
Atomic Number103
Atomic Mass266 u
CategoryActinide
State at Room TempSolid
Year Discovered1961
About Lawrencium
Named after Ernest Lawrence, inventor of the cyclotron, and the last of the actinides. Its chemistry surprised researchers by behaving more like a lanthanide than its neighbors. Made a few atoms at a time, its longest lived isotope survives about eleven hours. Decades of dispute between Berkeley and Dubna preceded the final naming. Research use only.
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