12
Mg
2
週期
3
s
個質子
電子
個中子
12
12
12
一般屬性
原子序數
12
標準原子質量
24.305
品質編號
24
類別
鹼土金屬
顏色
銀色
放射性
From Magnesia, district in Thessaly
晶體結構
簡單六角形
歷史
Scottish chemist Joseph Black recognized magnesium as an element in 1755.

Magnesium was first isolated by Sir Humphry Davy in 1808, in London.

He used electrolysis on a mixture of magnesia and mercuric oxide.

Antoine Bussy prepared it in coherent form in 1831.
每個外殼的電子
2, 8, 2
電子排布
[Ne] 3s2
Mg
When it burns in air, magnesium produces a brilliant white light
物理性質
物態
固體
密度
1.738 g/cm3
熔點
923.15 K | 650 °C | 1202 °F
沸點
1363.15 K | 1090 °C | 1994 °F
熔化熱
8.7 kJ/mol
汽化熱
128 kJ/mol
比熱容
1.023 J/g·K
地殼豐度
2.9%
宇宙豐度
0.06%
Magnesium
圖片來源: Images-of-elements
Magnesium swarf in a glass jar
CAS 編號
7439-95-4
Pubchem CID 編號
5462224
原子性質
原子半徑
160 pm
共價半徑
141 pm
電負性
1.31 (鲍林标度)
電離電位
7.6462 eV
原子體積
13.97 cm3/mol
熱導率
1.56 W/cm·K
氧化態
1, 2
應用
Magnesium is widely used in the manufacturing of mobile phones, laptop computers, cameras, and other electronic components.

The brilliant light it produces when ignited is made use of in photography, flares, pyrotechnics and incendiary bombs.

Magnesium compounds such as the hydroxide (milk of magnesia), sulfate (Epsom salts), chloride and citrate are used for medicinal purposes.
Because serious fires can occur, great care should be taken in handling magnesium metal
同位素
穩定同位素
24Mg, 25Mg, 26Mg
不穩定同位素
19Mg, 20Mg, 21Mg, 22Mg, 23Mg, 27Mg, 28Mg, 29Mg, 30Mg, 31Mg, 32Mg, 33Mg, 34Mg, 35Mg, 36Mg, 37Mg, 38Mg, 39Mg, 40Mg