38
Sr
2
週期
5
s
個質子
電子
個中子
38
38
50
一般屬性
原子序數
38
標準原子質量
87.62
品質編號
88
類別
鹼土金屬
顏色
銀色
放射性
Named after Strontian, a town in Scotland
晶體結構
面居中立方
歷史
Strontium was recognized as a new element in 1790 when Adair Crawford and his colleague William Cruickshank analyzed a mineral sample from a lead mine near Strontian, Scotland.

The element was eventually isolated by Sir Humphry Davy in 1808.

The isolation was done by the electrolysis of a mixture containing strontium chloride and mercuric oxide.
每個外殼的電子
2, 8, 18, 8, 2
電子排布
[Kr] 5s2
Sr
Strontium metal turns yellow when exposed to air
物理性質
物態
固體
密度
2.64 g/cm3
熔點
1050.15 K | 777 °C | 1430.6 °F
沸點
1655.15 K | 1382 °C | 2519.6 °F
熔化熱
8 kJ/mol
汽化熱
137 kJ/mol
比熱容
0.301 J/g·K
地殼豐度
0.036%
宇宙豐度
4×10-6%
The
圖片來源: Wikimedia Commons (Alchemist-hp)
The chemical element strontium as a synthetic made crystals, sealed under argon in a glas ampoule
CAS 編號
7440-24-6
Pubchem CID 編號
5359327
原子性質
原子半徑
215 pm
共價半徑
195 pm
電負性
0.95 (鲍林标度)
電離電位
5.6949 eV
原子體積
33.7 cm3/mol
熱導率
0.353 W/cm·K
氧化態
1, 2
應用
The primary use for strontium is in glass for color television cathode ray tubes.

Strontium salts are used in flares and fireworks for a crimson color.

Strontium chloride is used in toothpaste for sensitive teeth.

Strontium oxide is used to improve the quality of pottery glazes.
Strontium's non-radioactive isotopes are considered non-toxic
同位素
穩定同位素
84Sr, 86Sr, 87Sr, 88Sr
不穩定同位素
73Sr, 74Sr, 75Sr, 76Sr, 77Sr, 78Sr, 79Sr, 80Sr, 81Sr, 82Sr, 83Sr, 85Sr, 89Sr, 90Sr, 91Sr, 92Sr, 93Sr, 94Sr, 95Sr, 96Sr, 97Sr, 98Sr, 99Sr, 100Sr, 101Sr, 102Sr, 103Sr, 104Sr, 105Sr