Samarium
62
Sm
Gruppe
n/a
Periode
6
Blok
f
Protoner
Elektroner
Neutroner
62
62
88
Generelle Egenskaber
Atomnummer
62
Atommasse
150,36
Masseantal
150
Kategori
Lantanider
Farve
Sølv
Radioaktiv
Nej
From samarskite, a mineral named after Russian mine official, Col. Samarski
Krystalstruktur
Simpel Trigonal
Historie
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.
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
Samarium metal can be produced by reducing the oxide with lanthanum
Fysiske Egenskaber
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
Forekomst i jordskorpen
0,0006%
Forekomst i universet
5×10-7%
CAS-nummer
7440-19-9
PubChem CID-nummer
23951
Atomare egenskaber
Atomradius
180 pm
Kovalent radius
198 pm
Elektronegativitet
1,17 (Paulings skala)
Ioniseringspotentiale
5,6437 eV
Atomvolumen
20,0 cm3/mol
Varmeledningsevne
0,133 W/cm·K
Oxidationstrin
2, 3
Anvendelser
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.
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
Stabile isotoper
144Sm, 149Sm, 150Sm, 152Sm, 154SmUstabile isotoper
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