Samarium
62
Sm
Gruppe
n/a
Periode
6
Blokk
f
Protons
Electrons
Neutrons
62
62
88
Generelle eigenskapar
Atomnummer
62
Atommasse
150,36
Mass Number
150
Kategori
Lantanid
Farge
Silver
Radioactive
Nei
From samarskite, a mineral named after Russian mine official, Col. Samarski
Krystallstruktur
Simple 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.
Elektron per energinivå
2, 8, 18, 24, 8, 2
Elektronkonfigurasjon
[Xe] 4f6 6s2
Samarium metal can be produced by reducing the oxide with lanthanum
Fysiske eigenskapar
Tilstandsform
Fast stoff
Tettleik
7,52 g/cm3
Smeltepunkt
1345,15 K | 1072 °C | 1961,6 °F
Kokepunkt
2067,15 K | 1794 °C | 3261,2 °F
Smeltevarme
8,6 kJ/mol
Fordampingsvarme
175 kJ/mol
Spesifikk varmekapasitet
0,197 J/g·K
Abundance in Earth's crust
0,0006%
Abundance in Universe
5×10-7%
CAS Number
7440-19-9
PubChem CID Number
23951
Atom eigenskapar
Atomradius
180 pm
Kovalent radius
198 pm
Elektronegativitet
1,17 (Paulings skala)
Ioniseringspotensial
5,6437 eV
Molart volum
20,0 cm3/mol
Termisk konduktivitet
0,133 W/cm·K
Oksidasjonstrinn
2, 3
Applications
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
Isotopes
Stable Isotopes
144Sm, 149Sm, 150Sm, 152Sm, 154SmUnstable Isotopes
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