Lawrencium is the synthetic radioactive chemical element , with atomic number . It lies at the end of the actinide series; studying it requires producing small quantities of short-lived isotopes, rather than handling an ordinary macroscopic mineral sample.[ref]
Its listed neutral-atom ground-state electron configuration is . That assignment is a reminder that a simple extrapolation of light-element shell-filling rules can fail for heavy atoms. A neutral-atom configuration also does not by itself determine every accessible chemical oxidation state.
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Lawrencium is the chemical element with the symbol Lr and atomic number 103. It is classified as a synthetic element and belongs to the actinide series of the periodic table. Lawrencium was first synthesized in 1961 by a team of scientists at the University of California, Berkeley, and it was named in honor of Ernest O. Lawrence, the inventor of the cyclotron.