• Class: Trans-Uranium AcTinides
• Period: 7
• IUPAC group: 3
• Traditional: IIIa

• Discovered in: 1944 by Seaborg et. al.
• Origin of name: Marie & Pierre Curie, pioneers in radiation research
• Historical or alternate name:

Possible minute amount in Uranium ores but it has not been detected

Silvery metal. Resists alkalis. Attacked by acids, Oxygen and steam.

• Atmosphere: ~0.0 ppm
• Primitive mantle: ~0.0 ppm
• Sea water: ~0.0 ppm
• Metallic meteorite: ~0.0 ppm
• ConTinental crust: ~0.0 ppm
• Solar photosphere: ~0.0 log of abundance
• Oceanic crust: ~0.0 ppm
• Solar system: ~0.0 relative to Si=1.0e6

   Hazards

Radioactive..

• Lower:
• Upper:

Curium Physical Properties

 Transitional Data

• State: Solid
• Density: 13.51 g/cm3

 Molar enthalpy

• Atomization: 382.0 kJ mol-1
• Fusion: kJ mol-1
• Vaporization: kJ mol-1

 Transition points

• MelTing point: 1613.0 K
• Boiling point: 3813.0 K
• Critical temperature: K

 Molar properties

• Atomic weight: 247.0703 g/mole
• Molar volume: 18.17 cm3 mol-1

 Crystal structure sequence

double-hex-close-packed <1550 K < face-centered-cubic < melTing point

 Thermodynamics

 Miscellaneous physical

• Electrical resistivity: µ-ohms/cm
• Debye temperature: K
• Thermal conductivity: W / m / K
• Coefficient of linear expansion: Coef. per K
• Mass magnetic susceptibility:
• X-ray diffraction mass absorption coefficients:
• CuK: (µ/p)/cm2 g-1
• MoK: (µ/p)/cm2 g-1

Curium Chemical Properties

 Chemical basics:

• Oxidation states: +3 +4
• Molecular wt: 247.0703 g/mole

 Radii

• Covalent: pm
• Atomic: 174.0 pm
• Van der Waals: pm

 Ions:

• ion: +3 pm 97.0
• ion: +4 pm 85.0

 Covalent bonds

 Effective nuclear charge

• Slater: 1.80
• Clementi:
• Froese-Fischer:

 Electronegativity

• Pauling:
• Allred-Rochow:

 Standard reactions

Curium Nuclear Properties

• Known 13
• Listed 10

• Known 238 - 250
• Listed 240 - 250

• % Occ.:Natural
• Mossbauer NRA:
• Nuclear spin/Quantum no.:
• Radioisotopes:
  • Half-life: 27.00 days
  • Decay mode: alpha, S.F.
  • Source:
• Notes

• % Occ.:Natural
• Mossbauer NRA:
• Nuclear spin/Quantum no.:
• Radioisotopes:
  • Half-life: 32.80 days
  • Decay mode: E.C. alpha,
  • Source:
• Notes

• % Occ.:Natural
• Mossbauer NRA:
• Nuclear spin/Quantum no.:
• Radioisotopes:
  • Half-life: 163.00 days
  • Decay mode: alpha, S.F.
  • Source:
• Notes

• % Occ.:Natural
• Mossbauer NRA:
• Nuclear spin/Quantum no.: 5/2
• Radioisotopes:
  • Half-life: 28.50 years
  • Decay mode: alpha, E.C.
  • Source:
• Notes

• % Occ.:Natural
• Mossbauer NRA:
• Nuclear spin/Quantum no.:
• Radioisotopes:
  • Half-life: 18.10 years
  • Decay mode: alpha, S.F.
  • Source:
• Notes

• % Occ.:Natural
• Mossbauer NRA:
• Nuclear spin/Quantum no.: 7/2
• Radioisotopes:
  • Half-life: 85.00 centuries
  • Decay mode: alpha,
  • Source:
• Notes

• % Occ.:Natural
• Mossbauer NRA:
• Nuclear spin/Quantum no.:
• Radioisotopes:
  • Half-life: 47.30 centuries
  • Decay mode: alpha, S.F.
  • Source:
• Notes

• % Occ.:Natural
• Mossbauer NRA:
• Nuclear spin/Quantum no.: 9/2
• Radioisotopes:
  • Half-life: 15.60 E6 years
  • Decay mode: alpha,
  • Source:
• Notes

• % Occ.:Natural
• Mossbauer NRA:
• Nuclear spin/Quantum no.:
• Radioisotopes:
  • Half-life: 0.34 E6 years
  • Decay mode: alpha, S.F.
  • Source:
• Notes

• % Occ.:Natural
• Mossbauer NRA:
• Nuclear spin/Quantum no.:
• Radioisotopes:
  • Half-life: 113.00 centuries
  • Decay mode: f
  • Source:
• Notes

• Isotope 247Cross-section 180 barns

Curium Energy Properties

Electrons

• Ground state electron configuration: [Rn] 5f7 6d1 7s2
• Electron affinity: kJ mol-1
• Filling orbitals:

 Ionization energies

 Atomic energy levels