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Name: Curium Symbol: Cm
Group: Rare Earth, Actinides Atomic weight: (247)
Density @ 293 K: 13.5 g/cm3 Atomic volume: 18.28 cm3/mol
Group: Rare Earth, Actinides discovered: 1944


state (s, l, g): s
melting point: 1613.2 K boiling point: K
Heat of fusion: 15.0 kJ/mol Heat of vaporization: ?


1st ionization energy: 581 kJ/mole
electronegativity: 1.3 2nd ionization energy: kJ/mole
electron affinity: kJ/mole 3rd ionization energy: kJ/mole
Specific heat: ? heat atomization: kJ/mole atoms

Oxidation & Electrons:

Shells: 2,8,18,32,25,9,2 electron configuration: [Rn] 5f7 6d1 7s2
minimum oxidation number: 0 maximum oxidation number: 4
min. common oxidation no.: 0 max. common oxidation no.: 3

Appearance & Characteristics:

structure: fcc: face-centered cubic color: silvery-white
uses: thermoelec. pwr, n source toxicity:
hardness: mohs characteristics: Radioactive


reaction with air:
reaction with 6M HCl: reaction with 6M HCl:
reaction with 15M HNO3: reaction with 6M NaOH:

Other Forms:

number of isotopes: 0 hydride(s): CmH2
oxide(s): CmO Cm2O3 CmO2 chloride(s): CmCl3


ionic radius (2- ion): pm ionic radius (1- ion): pm
atomic radius: 174 pm ionic radius (1+ ion): pm
ionic radius (2+ ion): pm ionic radius (3+ ion): 111 pm


thermal conductivity: J/m-sec-deg
electrical conductivity: 1/mohm-cm polarizability: 23 A^3


source: Synthetic
rel. abund. solar system: log abundance earth's crust: log
cost, pure: $/100g cost, bulk: $/100g