Also called Lawrencium, it is the element number 103 of the periodic table, its sign is Lr, its atomic mass is 262 and its chemical series is the actinides, being the last of these. It was discovered, like most of the elements of its group, at the University of California at Berkeley, by the group of nuclear physics scientists, who operated within the laboratory owned by the university, a series of investigations that were under the tutelage of Albert Ghiorso.

The experiment in which the existence of the chemical was known, is summarized with the bombardment of some Californium isotopes with Boron-10 and 11 nuclei, determining itself as the heaviest compound synthesized within its chemical series. All of its isotopes are considered highly radioactive.

Ernest O. Lawrence, an American physicist who launched a procedure for the separation of uranium-235, invented the cyclotron in 1930, in addition to winning the Nobel Prize in 1939. According to different investigations, Lawrencium could be a transition metal (it can be seen in a solid state most of the time), but it has not been classified as one because it is already known to have properties that identify it as an actinide.

It has been shown that it is capable of producing volatile chlorine, being mixed with gaseous chlorine, just as it can be presented in aqueous form. At least 11 isotopes of it are known, among which Lr-266 stands out, as it is the heaviest, as is Lr-266, which disintegrates after 11 hours.