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Curium Metal Solid Radio
active
Synthetic
Symbol: Cm
Atomic number: 96
Atomic mass: (247.0703)
Group: Actinide
CAS-number: 7440-51-9
 
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Gd
Am Cm Bk
 

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Physical data

Electronic data  Thermal data  Steric 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
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Isotopes

NuclideAbundance [%]MassSpinHalflifeDecay modeDecay tree
241Cm02411/232.8dEC,AlphaView
242Cm0242.0590162.8dAlphaView
243Cm0243.0615/229.1yAlpha,ECView
244Cm0244.063018.1yAlphaView
245Cm0245.0667/28.5E03yAlphaView
246Cm0246.06704.76E03yAlpha,SFView
247Cm0247.079/21.56E07yAlphaView
248Cm0248.07203.48E05yAlpha,SFView
249Cm02491/21.069hBeta-View
250Cm02500~9.7E03ySFView
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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.
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