Samarium

62
Sm
Gruppe
n/a
Periode
6
Block
f
Protonen
Elektronen
Neutronen
62
62
88
Generelle Eigenschaften
Ordnungszahl
62
Atommasse
150,36
Massenzahl
150
Kategorie
Lanthanoide
Farbe
Silber
Radioaktiv
Nein
From samarskite, a mineral named after Russian mine official, Col. Samarski
Kristallstruktur
Einfach Trigonal
Geschichte
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.
Elektronen pro Schale
2, 8, 18, 24, 8, 2
Elektronenkonfiguration
[Xe] 4f6 6s2
Sm
Samarium metal can be produced by reducing the oxide with lanthanum
Physikalische Eigenschaften
Aggregatzustand
Fest
Dichte
7,52 g/cm3
Schmelzpunkt
1345,15 K | 1072 °C | 1961,6 °F
Siedepunkt
2067,15 K | 1794 °C | 3261,2 °F
Schmelzwärme
8,6 kJ/mol
Verdampfungswärme
175 kJ/mol
Spezifische Wärmekapazität
0,197 J/g·K
Häufigkeit in der Erdkruste
0,0006%
Häufigkeit im Universum
5×10-7%
Ultrapure
Danksagungen für Bilder: Images-of-elements
Ultrapure sublimated samarium
CAS-Nummer
7440-19-9
PubChem CID Number
23951
Atomeigenschaften
Atomradius
180 pm
Kovalenter Radius
198 pm
Elektronegativität
1,17 (Pauling-Skala)
Ionisierungsenergie
5,6437 eV
Molares Volumen
20,0 cm3/mol
Wärmeleitfähigkeit
0,133 W/cm·K
Oxidationszustände
2, 3
Anwendung
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
Isotope
Stabile Isotope
144Sm, 149Sm, 150Sm, 152Sm, 154Sm
Instabile Isotope
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