Lawrencium (Lr)

Lawrencium is the last element in the actinide series, named after Ernest O. Lawrence, inventor of the cyclotron.

Boron and californium nuclei spiralling together and fusing into lawrencium, whose electron shells visibly rearrange around it — Video: Boron and californium nuclei spiralling together and fusing into lawrencium, whose electron shells visibly rearrange around it

Properties of Lawrencium

Atomic number: 103
Category: Actinide
Atomic mass: 266 u
Electron configuration: [Rn] 5f¹⁴ 7s² 7p¹
Melting point: 1900 K (1626.85 °C)
Electronegativity (Pauling): 1.3
Appearance: Unknown, presumably metallic
Discovered by: Albert Ghiorso (1961)

Facts about Lawrencium

Lawrencium is named after Ernest Lawrence, who invented the cyclotron particle accelerator!
Lawrencium is the last element in the actinide series!
Lawrencium was first made by bombarding californium with boron atoms!
Only tiny amounts of lawrencium have ever been produced — just atoms at a time!

Lawrencium videos

Boron and californium nuclei spiralling together and fusing into lawrencium, whose electron shells visibly rearrange around it

Back to the periodic table · Lawrencium on Wikipedia