Lr

Lawrencium

Identification

CAS Number: 22537-19-5

Discovery Year: 1961

Discoverer: A.Ghiorso, T.Sikkeland, A.E.Larsh, R.M.Latimer

Discovery Location: United States

Properties

Atomic Mass: 262 →Density: 15.6 g/cm³ →

Atomic Dimensions

Van der Waals Radius: 246 pm

Electronic Structure

Electron Config: [Rn] 5f14 6d 7s2

Block: f

Period: 7 →

Oxidation States: +3

Abundance & Geochemistry

Goldschmidt Class: synthetic

About

Appearance unknown, however it is most likely silvery-white or grey and metallic. Lawrencium is a synthetic rare-earth metal. There are eight known radioisotopes, the most stable being Lr-262 with a half-life of 3.6 hours. Due to the short half-life of lawrencium, and its radioactivity, there are no known uses for it. Identified by Albert Ghiorso in 1961 at Berkeley. It was produced by bombarding californium with boron ions. The name is temporary IUPAC nomenclature, the origin of the name comes from Ernest O. Lawrence, the inventor of the cyclotron. If sufficient amounts of lawrencium were produced, it would pose a radiation hazard.

Isotopes

Lr-261 261 ☢ 39.0 min

Lr-262 262 ☢ 4.00 h