Lawrencium (Unniltrium, Unt, eka-Lutetium) is a radioactive synthetic element in the periodic table that has the symbol Lr and atomic number 103. Its most stable isotope is 262Lr, with a half-life of approximately 4 hours. Lawrencium is synthesized from californium and has no known uses.
Element 103 is a d-block element analogous to lutetium and therefore is increasingly being placed with the other d-block elements in the transition metal chemical series, but it is still most often grouped with the actinides in the periodic table.
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