WebElements

Periodic Table

lawrencium

Atomic number: 103
Atomic weight: 262
Symbol: Lr
Group number: (actinide)
Electronic configuration: [Rn].5f14.7s2.7p1 (tentative)

Description

Lawrencium is a synthetic "rare earth metal" which does not occur in the environment.

General information

Discoveror: Albert Ghiorso, Torbjorn Sikkeland, Almon Larsh, Robert M. Latimer
Date discovered: 1961
Discovered at: United States
Meaning of name: Temporary IUPAC nomenclature. The origin of the Amercian Chemical Society preferred name is Ernest O. "Lawrence", inventor of the cyclotron

Physical data

Standard state: unknown but presumably a solid at 298 K
Colour: /TR>

Isotopes

This section gives some data for naturally occurring isotopes.
Nominal mass Accurate mass % natural abundance
nil

Further Information

Copyright 1997 Mark Winter
Department of Chemistry at the University of Sheffield, Sheffield S3 7HF, England.

The current version of this document is at http://www.shef.ac.uk/~chem/web-elements-I/Lr.html