Lawrencium

103
Lr
260

Properties

Symbol Name Atomic Number Atomic Weight Group Number
Lr Lawrencium 103 260 3

Description

Standard State: presumably a solid at 298 K
Color: unknown, but probably metallic and silvery white or gray in appearance

Lawrencium was discovered in March 1961 by A. Ghiorso, T. Sikkeland, A.E. Larsh, and R.M. Latimer.  Lawrencium is a synthetic "rare earth metal" which does not occur in the environment.  The electrically charged transmutation nuclei recoiled with an atmosphere of helium and were collected on a thin copper conveyor tape which was then moved to pace collected atoms in front of a series of soled-state detectors.