62
Sm
無法計量
週期
6
f
個質子
電子
個中子
62
62
88
一般屬性
原子序數
62
標準原子質量
150.36
品質編號
150
類別
鑭系元素
顏色
銀色
放射性
From samarskite, a mineral named after Russian mine official, Col. Samarski
晶體結構
簡單三角
歷史
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.
每個外殼的電子
2, 8, 18, 24, 8, 2
電子排布
[Xe] 4f6 6s2
Sm
Samarium metal can be produced by reducing the oxide with lanthanum
物理性質
物態
固體
密度
7.52 g/cm3
熔點
1345.15 K | 1072 °C | 1961.6 °F
沸點
2067.15 K | 1794 °C | 3261.2 °F
熔化熱
8.6 kJ/mol
汽化熱
175 kJ/mol
比熱容
0.197 J/g·K
地殼豐度
0.0006%
宇宙豐度
5×10-7%
Ultrapure
圖片來源: Images-of-elements
Ultrapure sublimated samarium
CAS 編號
7440-19-9
Pubchem CID 編號
23951
原子性質
原子半徑
180 pm
共價半徑
198 pm
電負性
1.17 (鲍林标度)
電離電位
5.6437 eV
原子體積
20.0 cm3/mol
熱導率
0.133 W/cm·K
氧化態
2, 3
應用
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
同位素
穩定同位素
144Sm, 149Sm, 150Sm, 152Sm, 154Sm
不穩定同位素
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