Samarium
62
Sm
Groep
n.v.t.
Periode
6
Blok
f
Protonen
Elektronen
Neutronen
62
62
88
Algemene Eigenschappen
Atoomnummer
62
Atomair gewicht
150,36
Massa Getal
150
Categorie
Lanthaniden
Kleur
Zilver
Radioactief
Nee
From samarskite, a mineral named after Russian mine official, Col. Samarski
Kristalstructuur
Eenvoudige Trigonaal
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.
Eletronen per schil
2, 8, 18, 24, 8, 2
Electronconfiguratie
[Xe] 4f6 6s2
Samarium metal can be produced by reducing the oxide with lanthanum
Fysieke Eigenschappen
Fase
Vast
Dichtheid
7,52 g/cm3
Smeltpunt
1345,15 K | 1072 °C | 1961,6 °F
Kookpunt
2067,15 K | 1794 °C | 3261,2 °F
Fusiewarmte
8,6 kJ/mol
Verdampingswarmte
175 kJ/mol
Specifieke Warmtecapaciteit
0,197 J/g·K
Overvloedig aanwezig in de aardkorst
0,0006%
Overvloedig aanwezig in het universum
5×10-7%
CAS-nummer
7440-19-9
PubChem CID nummer
23951
Atoomeigenschappen
Atoomstraal
180 pm
Covalentiestraal
198 pm
Electronegativiteit
1,17 (Pauling schaal)
Ionisatiepotentiaal
5,6437 eV
Atoomvolume
20,0 cm3/mol
Thermische geleiding
0,133 W/cm·K
Oxidatietoestanden
2, 3
Toepassingen
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
Isotopen
Stabiele isotopen
144Sm, 149Sm, 150Sm, 152Sm, 154SmInstabiele isotopen
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