Samarij

62
Sm
Skupina
n/a
Perioda
6
Blok
f
Protons
Electrons
Neutrons
62
62
88
General Properties
Vrstno število
62
Atomska teža
150,36
Mass Number
150
Kategorija
Lantanoidi
Barva
Silver
Radioactive
Ne
From samarskite, a mineral named after Russian mine official, Col. Samarski
Kristalna struktura
Simple Trigonal
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.
Electrons per shell
2, 8, 18, 24, 8, 2
Razporeditev elektronov
[Xe] 4f6 6s2
Sm
Samarium metal can be produced by reducing the oxide with lanthanum
Physical Properties
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
Abundance in Earth's crust
0,0006%
Abundance in Universe
5×10-7%
Ultrapure
Zasluge za slike: Images-of-elements
Ultrapure sublimated samarium
CAS Number
7440-19-9
PubChem CID Number
23951
Atomic Properties
Atomski polmer
180 pm
Kovalentni polmer
198 pm
Elektronegativnost
1,17 (Paulingova lestvica)
Ionization Potential
5,6437 eV
Atomic Volume
20,0 cm3/mol
Toplotna prevodnost
0,133 W/cm·K
Oksidacijska stanja
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.
Samarium is considered to be moderately toxic
Isotopes
Stable Isotopes
144Sm, 149Sm, 150Sm, 152Sm, 154Sm
Unstable 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