Curium

Curium (Cm)

Radioactive metallic transuranic element. Belongs to actinoid series. Nine known isotopes, Cm-247 has a half-life of 1.64*10^7 years. First identified by Glenn T. Seaborg and associates in 1944, first produced by L.B. Werner and I. Perlman in 1947 by bombarding americium-241 with Neutrons. Named for Marie Curie.
Atomic Number96
Atomic Weight247
Mass Number233
Group
Period7
Blockf
Protons96 p+
Neutrons137 n0
Electrons96 e-
Cm-Fluoreszenz.png Animated Bohr Model Enhanced Bohr Model Bohr Model Orbital Diagram

Properties

Atomic Radius
Atomic Volume
18.28 cm³/mol
Covalent Radius
166 pm
Metallic Radius
Ionic Radius
97 pm
Crystal Radius
111.00000000000001 pm
Van der Waals radius
245.00000000000003 pm
Density
13.51 g/cm³
Boiling Point
Melting Point
1,340 K
Electrons per shell2, 8, 18, 32, 25, 9, 2
Electronegativity
Electrophilicity
Proton Affinity
Electron Affinity
Ionization Potential
Heat of Vaporization
Heat of Fusion
Heat of Formation
386 kJ/mol
Molar Heat Capacity
Specific Heat Capacity
Thermal Conductivity
Gas Basicity
Dipole Polarizability
144 a₀
C6 Dispersion Coefficient
Oxidation States3, 4
Color
Silver
Crystal StructureSimple Hexagonal ()
Lattice Constant
Bulk Modulus
Electrical Resistivity
Electron Configuration[Rn] 5f7 6d1 7s2
Magnetic Ordering
Magnetic Susceptibility
PhaseSolid
Poisson Ratio
Shear Modulus
Young's Modulus
Allotropes
Alternate Names
Adiabatic Index
Appearance
Electric Conductivity
Critical Pressure
Critical Temperature
Curie Point
Electrical
Hardness
Magnetic Susceptibility
Magnetic
Neel Point
Neutron Cross Section
Neutron Mass Absorption
Gas Phase
Quantum Numbers
Refractive Index
Space Group
Speed of Sound
Superconducting Point
Thermal Expansion
Valence Electrons
Classification
CategoryActinides, Actinides
CAS Group
IUPAC Group
Glawe Number40
Mendeleev Number28
Pettifor Number41
Geochemical Class
Goldschmidt Classsynthetic
Radioactivity
RadioactiveYes ☢️
Decay Mode
Half-Life
Lifetime
Abundance
Abundance in Earth's crust
Abundance in Oceans
Abundance in Human Body
Abundance in Meteor
Abundance in Sun
Abundance in Universena

Isotopes of Curium

Stable Isotopes
Unstable Isotopes
233Cm 234Cm 235Cm 236Cm 237Cm 238Cm 239Cm 240Cm 241Cm 242Cm 243Cm 244Cm 245Cm 246Cm 247Cm 248Cm 249Cm 250Cm 251Cm 252Cm

History

Curium was discovered by Glenn T. Seaborg, Ralph A. James and Albert Ghiorso in 1944 at the University of California, Berkeley. It was produced by bombarding plutonium with alpha particles during the Manhattan Project. Curium metal was produced only in 1951 by reduction of curium fluoride with barium. Curium is named after Madame Curie and her husband Pierre Curie

DiscoverersG.T.Seaborg, R.A.James, A.Ghiorso
Discovery LocationUnited States
Discovery Year1944
Name OriginNamed in honor of Pierre and Marie Curie.
Curium is harmful due to its radioactivity
Curium accumulates in the bones, lungs and liver, where it promotes cancer

Uses

Curium is mainly used for scientific research purposes. Curium is a common starting material for the production of higher transuranic elements and transactinides. The most practical application of 244Cm is as α-particle source in the alpha particle X-ray spectrometers (APXS). It has no significant commercial applications.

Sources

Made by bombarding plutonium with helium ions. So radioactive it glows in the dark.