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Metal radioactivesyntheticsolid
Symbol: Cm
Atomic number: 96
Atomic mass: (247.0703)
Group: Actinide
CAS-number: 7440-51-9

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Physical data

Electronic dataThermal dataSteric data
Shells: 2, 8, 18, 32, 25, 9, 2
Orbitals: [Rn] 5f7 6d1 7s2
Electronegativity: --, 1.2
1. Ionization potential: 6.02 eV
2. Ionization potential: -- eV
3. Ionization potential: -- eV
Oxidation states: 4, 3
Electrical conductivity: --
Melting point: 1340 °C
Boiling point: -- °C
Specific heat: -- J/gK
Heat of fusion: 15.0 kJ/mol
Heat of vaporization: -- kJ/mol
Thermal conductivity: 0.1 W/cmK
Atomic radius: -- Å
Ionic radius: -- Å
Covalent radius: -- Å
Atomic volume: 18.28 cm³/mol
Density (293 K): 13.5 g/cm³
Crystal structure: hexagonal
hexagonal

Isotopes

NuclideAbundance [%]MassSpinHalflifeDecay modeDecay tree
241Cm 0 241 1/2 32.8d EC, α View
242Cm 0 242.059 0 162.8d α View
243Cm 0 243.061 5/2 29.1y α, EC View
244Cm 0 244.063 0 18.1y α View
245Cm 0 245.066 7/2 8.5E03y α View
246Cm 0 246.067 0 4.76E03y α, SF View
247Cm 0 247.07 9/2 1.56E07y α View
248Cm 0 248.072 0 3.48E05y α, SF View
249Cm 0 249 1/2 1.069h β- View
250Cm 0 250 0 ~9.7E03y SF View

Other info

Name origin:Named in honor of Pierre and Marie Curie.
Description:Silvery, malleable, synthetic, radioactive metal.
Discovered by:G.T.Seaborg, R.A.James, A.Ghiorso
Year:1944
Place:United States
Sources:Made by bombarding plutonium with helium ions. So radioactive it glows in the dark.
Use(s):It has no significant commercial applications.