Element Curium

Curium ElementThis element of the actinide series was named after Marie and Pierre Curie – both were known for their research on radioactivity.
Curium was first intentionally produced and identified in July 1944 by the group of Glenn T. Seaborg at the University of California, Berkeley.
Curium is a transuranic radioactive chemical element with the symbol Cm and atomic number 96.
A synthetic, radioactive element, curium is a hard, dense metal with a silvery-white appearance and physical and chemical properties resembling those of gadolinium.
Its melting point of 1340 °C is significantly higher than that of the previous transuranic elements neptunium (637 °C), plutonium (639 °C) and americium (1173 °C)

Names and Identifiers

Chemical Formula:Cm
CAS:7440-51-9
Molecular Weight:247.00000g/mol
EC Number :n/a
MDL Number:n/a
Color:silvery white
Other Names:Curio
PubChem CID:23979
IUPAC Name:Curium
Inchl:InChI=1S/Cm
InChI Key:NIWWFAAXEMMFMS-UHFFFAOYSA-N
Canonical SMILES:[Cm]
ICSC Number:n/a

Physical & Chemical Properties

Phase:Solid
Density:13.51 g/cm³
Boiling Point:3383 K ​(3110 °C, ​5630 °F)
Melting Point:1613 K ​(1340 °C, ​2444 °F)
Molecular Formula:Cm
Flash Point:1175ºC
Exact Mass:247.07000

About 19 radioisotopes and 7 nuclear isomers between 233Cm and 251Cm are known for curium, none of which are stable.

Radiosotope data

IsotopeMass/DaHalf-lifeMode of decayNuclear spinNuclear magnetic moment
240Cm240.0555227 hα to 236Pu; EC to 240Am; SF0
241Cm241.0576532.8 dα to 237Pu; EC to 241Am1/2
242Cm242.05883162.8 dα to 238Pu; SF0
243Cm243.0613828.5 yα to 239Pu; EC to 243Am5/20.41
244Cm244.0627518.11 yα to 240Pu; SF0
245Cm245.065488500 yα to 241Pu; SF7/20.5
246Cm246.067224780 yα to 242Pu; SF0
247Cm247.070347 (5)1.56 x 107 yα to 243Pu9/20.37
248Cm248.072343.4 x 105 yα to 244Pu; SF0
249Cm249.0759564.15 mβ to 249Bk1/2
250Cm250.078359700 yα to 246Pu; β to 250Bk; SF0

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