Science / Periodic Table of Elements / Lawrencium (Lr): Atomic number: 103, Atomic mass: (262) g.mol -1, Electronegativity: unknown, Density: unknown, Melting point: unknown, Boiling point: unknown, Vanderwaals radius: unknown, Ionic radius: unknown, Isotopes: 1, Electronic shell: [ Rn ] 5f14 6d1 7s2, Discovered by: Albert Ghiorso in 1961. Lawrencium is the second transferium element with the most stable isotope 262 Lr having a half-life of 216 minutes. It's chemical data are limited to its atomic number, its haf life and isotopes. Atomic weight of known its 11 isotopes range from 252 to 262. It is named after Ernest O. Lawrence, the inventor of the cyclotron, the research instrument with which several new elements havve been first produced. Applications: The transferium elements have neither application nor economic role. Lawrencium in the environment: The transferium elements do not exist in nature and they have very unstable nuclei, so they are quite hard to make and detect.