A radioactive metallic transuranic element belonging to the actinoids; a.n. 103; mass number of the first discovered isotope 257 (half-life 8 seconds). A number of very short-lived isotopes have now been synthesized. The element was identified by Albert Ghiorso and associates in 1961. It was named after Ernest Orlando Lawrence (1901–58).

https://www.webelements.com/lawrencium/ Information from the WebElements site