Lawrencium - Lr

Lawrencium (Lr)

Lawrencium is a radioactive actinide produced in very small quantities. It does not have a standard atomic weight; the bracketed value below identifies a representative isotope mass number.

Atomic number103
Representative isotope mass number[262]
Electron configuration[Rn] 5f14 7s2 7p1
Densitynot established
Melting point1627 (estimated) °C
Boiling pointnot established

Lawrencium (element Lr)

Uses and applications

Lawrencium has no applications outside research. Only a few atoms have been produced, mainly to investigate the properties and periodic-table position of the heaviest actinide.

Lawrencium and water management

Lawrencium is not used in water treatment and is not expected in ordinary water supplies. Any possible occurrence in research or nuclear waste would require specialised radiological characterisation and management.

Occurrence and environmental context

Lawrencium is a synthetic actinide with no stable isotopes. Its occurrence outside controlled production is extremely limited. Environmental assessment, if relevant, depends on isotope, activity, chemical form, and the specific source.

Health and safety

Lawrencium requires specialised radiological controls. Exposure risk depends on isotope, activity, chemical form, and exposure route. Follow applicable radiation-protection procedures and institutional requirements when handling radioactive materials or waste.

Back to the periodic table of elements

Sources and further reading

Element page last reviewed: 24 October 2026 by Lenntech.