Curium

Metal

synthetic

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

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Physical data

Electronic 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: --

Thermal data

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

Steric data

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

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

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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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