Properties

Atomic Number	103
CAS Registry Number	22537-19-5
Chemical Symbol	Lr

History

The atomic number is 103 and the chemical symbol is Lr. The original chemical symbol was proposed as Lw but it was changed because W is an unusual occurrence in many languages and it is a cumbersome spoken word. The name derives from the American physicist Ernest 0. Lawrence who developed the cyclotron. Credit for the first synthesis of this element in 1971 is given jointly to American chemists from the University of California laboratory in Berkeley California under Albert Ghiorso and the Russian scientific team at the JINR (Joint Institute for Nuclear Reactions) lab in Dubna Russia under Georgi N. Flerov after a series of preliminary papers presented over a decade. The longest half-life associated with this unstable element is 3.6 hour 262Lr.

Holden, Norman E., (2004). History of the origin of the chemical elements and their discoverers. National Nuclear Data Center. Retrieved from http://www.nndc.bnl.gov/content/elements.html