Samarium
62
Sm
Grupp
Ej tillämplig
Period
6
Block
f
Protoner
Elektroner
Neutroner
62
62
88
Generella Egenskaper
Atomnummer
62
Atommassa
150,36
Masstal
150
Kategori
Lantanoider
Färg
Silver
Radioaktiv
Nej
From samarskite, a mineral named after Russian mine official, Col. Samarski
Kristallstruktur
Enkelt trigonal
Historia
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 per skal
2, 8, 18, 24, 8, 2
Elektronkonfiguration
[Xe] 4f6 6s2
Samarium metal can be produced by reducing the oxide with lanthanum
Fysikaliska Egenskaper
Aggregationstillstånd
Fast
Densitet
7,52 g/cm3
Smältpunkt
1345,15 K | 1072 °C | 1961,6 °F
Kokpunkt
2067,15 K | 1794 °C | 3261,2 °F
Smältvärme
8,6 kJ/mol
Ångbildningsvärme
175 kJ/mol
Specifik värmekapacitet
0,197 J/g·K
Förekomst i jordskorpan
0,0006%
Förekomst i universum
5×10-7%
CAS-nummer
7440-19-9
PubChem CID-nummer
23951
Atomära Egenskaper
Atomradie
180 pm
Kovalent radie
198 pm
Elektronegativitet
1,17 (Paulingskalan)
Jonisationspotential
5,6437 eV
Molvolym
20,0 cm3/mol
Värmeledningsförmåga
0,133 W/cm·K
Oxidationstillstånd
2, 3
Användningsområden
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
Stabila isotoper
144Sm, 149Sm, 150Sm, 152Sm, 154SmInstabila 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