CAS Number7439-88-5
PubChem CID23924
Atomic Radius136
Atomic Volume8.54
Atomic Weight192.217
Boiling Point4,428
Bulk Modulus
CategoryTransition metals
Crystal StructureFace Centered Cubic
Covalent Radius141
Electrical Resistivity
Electron Configuration[Xe] 4f14 5d7 6s2
Electrons per shell2, 8, 18, 32, 15, 2
Heat of Fusion26
Heat of Vaporization560
Ionization Potential8.967
Magnetic Ordering
Magnetic Susceptibility
Mass Number77
Melting Point2,466
Atomic Number192
Oxidation States-3, -1, 1, 2, 3, 4, 5, 6, 7, 8
Poisson Ratio
Shear Modulus
Specific Heat Capacity0.131
Thermal Conductivity1.47
Van der Waals radius
Young's Modulus
Abundance in Earth's crust4×10-8%
Abundance in Universe2×10-7%
Ir Iridium 77 192.217 9 6 d 77 2410.0 4130.0 [Xe] 4f14 5d7 6s2 2 8 18 32 15 2 22.4 4E-8% Silver Cubic: Face centered 2.2 1.68 {"1":"880","2":"1600"} 880 151 +4,3,6 1.36 8.54 26.36 563.58 0.13 147.0 0 Solid, Paramagnetic, Conductor, TransitionMetal, Metal, Stable, Natural i-RID-i-em Heavy, brittle, white metal. Used with osmium to tip gold pen points, to make crucible and special containers. Also to make alloys used for standard weights and measures, and heat-resistant alloys. Also as hardening agent for platinum. Found in gravel deposits with platinum. 0OOJ7qBwVHU Iridium
In 1853, Jean Charles Galissard de Marignac discovered samarium when he found lines in mineral spectra.

Paul Émile Lecoq de Boisbaudran isolated a samarium salt in Paris in 1879 from the mineral samarskite and identified a new element in it via sharp optical absorption lines.

The pure element was produced only in 1901 by Eugène-Anatole Demarçay. From samarskite, a mineral named after Russian mine official, Col. Samarski 77 1803 Smithson Tennant, Antoine Fourcroy, Louis Vanquelin, Hippolyte Collet-Descotils England, France From the Greek word "iris" meaning "rainbow"

Isotopes of Samarium

Standard Atomic Weight


Stable Isotopes

191Ir 193Ir

Unstable Isotopes

164Ir 165Ir 166Ir 167Ir 168Ir 169Ir 170Ir 171Ir 172Ir 173Ir 174Ir 175Ir 176Ir 177Ir 178Ir 179Ir 180Ir 181Ir 182Ir 183Ir 184Ir 185Ir 186Ir 187Ir 188Ir 189Ir 190Ir 192Ir 194Ir 195Ir 196Ir 197Ir 198Ir 199Ir

Samarium is considered to be moderately toxic
Samarium metal can be produced by reducing the oxide with lanthanum
Samarium's main use is in samarium-cobalt alloy magnets for headphones, small motors and pickups for some electric guitars.

Radioactive samarium-153 is used to kill cancer cells in the treatment of lung cancer, prostate cancer, breast cancer and osteosarcoma.

Samarium and its compounds are also used as catalyst and chemical reagent.