96
247.00
Cm
Curium
Identification
CAS Number: 7440-51-9
Discovery Year: 1944
Discoverer: G.T.Seaborg, R.A.James, A.Ghiorso
Discovery Location: United States
Properties
Atomic Dimensions
Atomic Radius (Rahm): 276 pm
Covalent Radius: 169 pm →Van der Waals Radius: 245.00000000000003 pm
Atomic Volume: 18.28 cm³/mol
Thermodynamics
Melting Point: 1340 K →
Heat of Formation: 386 kJ/mol
Electronic Structure
Abundance & Geochemistry
Goldschmidt Class: synthetic
About
Radioactive metallic transuranic element. Belongs to actinoid series. Nine known isotopes, Cm-247 has a half-life of 1.64*10^7 years. First identified by Glenn T. Seaborg and associates in 1944, first produced by L.B. Werner and I. Perlman in 1947 by bombarding americium-241 with Neutrons. Named for Marie Curie.
Isotopes
Cm-243 243 ☢ 29.1 a
Cm-244 244 ☢ 18.1 a
Cm-245 245 ☢ 8.42e+3 a
Cm-246 246 ☢ 4.71e+3 a
Cm-247 247 ☢ 1.56e+7 a
Cm-248 248 ☢ 3.48e+5 a
