Samarij
62
Sm
Skupina
n/p
Perioda
6
Blok
f
Protoni
Elektroni
Nevtroni
62
62
88
Splošne lastnosti
Vrstno število
62
Atomska teža
150,36
Masno število
150
Kategorija
Lantanoidi
Barva
Srebrna
Radioaktivno
Ne
From samarskite, a mineral named after Russian mine official, Col. Samarski
Kristalna struktura
Enostavna trigonalna
Zgodovina
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.
Elektroni po lupinah
2, 8, 18, 24, 8, 2
Razporeditev elektronov
[Xe] 4f6 6s2
Samarium metal can be produced by reducing the oxide with lanthanum
Fizikalne lastnosti
Faza snovi
Trdnina
Gostota
7,52 g/cm3
Tališče
1345,15 K | 1072 °C | 1961,6 °F
Vrelišče
2067,15 K | 1794 °C | 3261,2 °F
Talilna toplota
8,6 kJ/mol
Izparilna toplota
175 kJ/mol
Toplotna kapaciteta
0,197 J/g·K
Zastopanost v Zemljini skorji
0,0006%
Zastopanost v vesolju
5×10-7%
CAS številka
7440-19-9
PubChem CID številka
23951
Atomske lastnosti
Atomski polmer
180 pm
Kovalentni polmer
198 pm
Elektronegativnost
1,17 (Paulingova lestvica)
Ionizacijski potencial
5,6437 eV
Atomski volumen
20,0 cm3/mol
Toplotna prevodnost
0,133 W/cm·K
Oksidacijska stanja
2, 3
Uporabe
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
Izotopi
Stabilni izotopi
144Sm, 149Sm, 150Sm, 152Sm, 154SmNestabilni izotopi
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