Samariu
62
Sm
Grupă
n/a
Perioadă
6
Bloc
f
Protoni
Electroni
Neutroni
62
62
88
Proprietăți Generale
Număr atomic
62
Masă atomică
150,36
Numar de masa
150
Categorie
Lantanide
Culoare
Argint
Radioactive
Nu
De la samarskite, un mineral numit pentru onoarea col. Samarski
Structură cristalină
Simplu Trigonal
Istoric
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.
Electroni pe nivelul de energie
2, 8, 18, 24, 8, 2
Configurație electronică
[Xe] 4f6 6s2
Samarium metal can be produced by reducing the oxide with lanthanum
Proprietăți Fizice
Fază
Solid
Densitate
7,52 g/cm3
Punct de topire
1345,15 K | 1072 °C | 1961,6 °F
Punct de fierbere
2067,15 K | 1794 °C | 3261,2 °F
Energie de fuziune
8,6 kJ/mol
Energie de evaporare
175 kJ/mol
Căldură specifică
0,197 J/g·K
Abundența în scoarța Pământului
0,0006%
Abundența în Univers
5×10-7%
Numarul CAS
7440-19-9
Număr CID PubChem
23951
Proprietăți Atomice
Rază atomică
180 pm
Rază de covalență
198 pm
Electronegativitate
1,17 (Scara lui Pauling)
Potențial de ionizare
5,6437 eV
Volum molar
20,0 cm3/mol
Conductivitate termică
0,133 W/cm·K
Număr de oxidare
2, 3
Aplicații
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
Izotopi stabili
144Sm, 149Sm, 150Sm, 152Sm, 154SmIzotopi instabili
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