Curium - Cm

Curium (Cm)

Curium is a radioactive, synthetic actinide produced in minute quantities in nuclear reactors. Its isotopes have different half-lives; curium-247 is among the longer-lived isotopes.

Atomic number96
Representative isotope mass number[247] (representative isotope mass number)
Electron configuration[Rn] 5f7 6d1 7s2
Density13.5 (reported) g/cm3
Melting point1345 °C
Boiling pointnot well established

Curium (element Cm)

Uses and applications

Curium has been used in specialised space-science instruments, including alpha-particle X-ray spectrometers that analyse the composition of planetary materials. Its use is limited by radioactivity, scarcity, and the need for specialised controls.

Curium and water management

Curium is not used in conventional water treatment. If present in a water or waste stream, it requires isotope-specific radiological characterisation, containment, and management by qualified programmes.

Occurrence and environmental context

Curium is an actinide, and its occurrence and environmental behaviour depend on isotope, chemical form, and source. Natural geology, mineral processing, and nuclear-related activities can each affect whether an actinide is present in a water or waste stream. Monitoring should distinguish chemical concentration from radioactive activity where relevant.

Health and safety

Curium requires careful handling because of its radioactive properties; for some elements, chemical toxicity is also relevant. Exposure depends on isotope, activity, chemical form, and route. Follow applicable radiation-protection procedures and substance-specific safety information.

Back to the periodic table of elements

Sources and further reading

Element page last reviewed: 24 October 2026 by Lenntech.