Самариум

62
Sm
Група
Нема одговор
Периода
6
блок
f
Protons
Electrons
Neutrons
62
62
88
Општи Својства
Атомски број
62
Атомска тежина
150,36
Mass Number
150
Category
Ланта­ноид
Color
Silver
Radioactive
Не
From samarskite, a mineral named after Russian mine official, Col. Samarski
Кристална структура
Simple Trigonal
History
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
Електронска конфигурација
[Xe] 4f6 6s2
Sm
Samarium metal can be produced by reducing the oxide with lanthanum
Физички Својства
Фаза
Solid
Густина
7,52 g/cm3
Точка на топење
1345,15 K | 1072 °C | 1961,6 °F
Точка на вриење
2067,15 K | 1794 °C | 3261,2 °F
Топлина на топење
8,6 kJ/mol
Топлина на испарување
175 kJ/mol
Specific Heat Capacity
0,197 J/g·K
Abundance in Earth's crust
0,0006%
Abundance in Universe
5×10-7%
Ultrapure
Кредити на слика: Images-of-elements
Ultrapure sublimated samarium
CAS Number
7440-19-9
PubChem CID Number
23951
Атомски Својства
Атомски полупречник
180 pm
Ковалентен полупречник
198 pm
Електронегативност
1,17 (Полингова скала)
Ionization Potential
5,6437 eV
Atomic Volume
20,0 cm3/mol
Thermal Conductivity
0,133 W/cm·K
Oxidation States
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