Samarij
62
Sm
Skupina
n/a
Perioda
6
Blok
f
Protoni
Elektroni
Neutroni
62
62
88
Opća svojstva
Atomski broj
62
Relativna atomska masa
150,36
Maseni broj
150
Kategorija
Lantanoidi
Boja
Srebrna
Radioaktivan
Ne
Od samarskita, minerala imenovanom po ruskom oficiru rudnika, pukovniku Samarskiju
Kristalna struktura
Jednostavna Trigonska
Povijest
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.
Elektrona po ljusci
2, 8, 18, 24, 8, 2
Elektronska konfiguracija
[Xe] 4f6 6s2
Samarium metal can be produced by reducing the oxide with lanthanum
Fizikalna svojstva
Agregacijsko stanje
Čvrsto
Gustoća
7,52 g/cm3
Talište
1345,15 K | 1072 °C | 1961,6 °F
Vrelište
2067,15 K | 1794 °C | 3261,2 °F
Toplina taljenja
8,6 kJ/mol
Toplina isparavanja
175 kJ/mol
Specifični toplinski kapacitet
0,197 J/g·K
Zastupljenost u Zemljinoj kori
0,0006%
Zastupljenost u svemiru
5×10-7%
CAS broj
7440-19-9
PubChem CID broj
23951
Atomska svojstva
Atomski radijus
180 pm
Kovalentni radijus
198 pm
Elektronegativnost
1,17 (Paulingova ljestvica)
Potencijal ionizacije
5,6437 eV
Atomski volumen
20,0 cm3/mol
Toplinska vodljivost
0,133 W/cm·K
Stanja oksidacije
2, 3
Primjene
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