Lr, or Lawrencium, is a synthetic element with the atomic number 103. It was first discovered in 1961 by a team of scientists at the Lawrence Berkeley National Laboratory. As a member of the actinide series, it is classified as a heavy metal and is typically produced in particle accelerators through the bombardment of lighter elements. Due to its instability and radioactivity, Lr has no significant commercial applications and is primarily used for research purposes. It is named after the Lawrence family, who contributed to the development of nuclear science. Its most stable isotope, Lr-262, has a half-life of about 3.6 hours.