Samarium

62
Sm
Gruppe
n/a
Periode
6
Blok
f
Protons
Electrons
Neutrons
62
62
88
General Properties
Atomnummer
62
Atommasse
150,36
Mass Number
150
Kategori
Lantanider
Farve
Silver
Radioactive
Nej
From samarskite, a mineral named after Russian mine official, Col. Samarski
Krystalstruktur
Simpel Trigonal
History
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.
Elektroner i hver skal
2, 8, 18, 24, 8, 2
Elektronkonfiguration
[Xe] 4f6 6s2
Sm
Samarium metal can be produced by reducing the oxide with lanthanum
Physical Properties
Tilstandsform
Fast stof
Massefylde
7,52 g/cm3
Smeltepunkt
1345,15 K | 1072 °C | 1961,6 °F
Kogepunkt
2067,15 K | 1794 °C | 3261,2 °F
Smeltevarme
8,6 kJ/mol
Fordampningsvarme
175 kJ/mol
Varmefylde
0,197 J/g·K
Abundance in Earth's crust
0,0006%
Abundance in Universe
5×10-7%
Ultrapure
Billede akkrediteringer: Images-of-elements
Ultrapure sublimated samarium
CAS Number
7440-19-9
PubChem CID Number
23951
Atomic Properties
Atomradius
180 pm
Kovalent radius
198 pm
Elektronegativitet
1,17 (Paulings skala)
Ionization Potential
5,6437 eV
Atomic Volume
20,0 cm3/mol
Varmeledningsevne
0,133 W/cm·K
Oxidationstrin
2, 3
Applications
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.
Samarium is considered to be moderately toxic
Isotoper
Stable Isotopes
144Sm, 149Sm, 150Sm, 152Sm, 154Sm
Unstable Isotopes
128Sm, 129Sm, 130Sm, 131Sm, 132Sm, 133Sm, 134Sm, 135Sm, 136Sm, 137Sm, 138Sm, 139Sm, 140Sm, 141Sm, 142Sm, 143Sm, 145Sm, 146Sm, 147Sm, 148Sm, 151Sm, 153Sm, 155Sm, 156Sm, 157Sm, 158Sm, 159Sm, 160Sm, 161Sm, 162Sm, 163Sm, 164Sm, 165Sm