27
Co
9
週期
4
d
個質子
電子
個中子
27
27
32
一般屬性
原子序數
27
標準原子質量
58.933195
品質編號
59
類別
過渡金屬
顏色
灰色
放射性
From the German word Kobald, goblin or evil spirit; also from the Greek cobalos, mine
晶體結構
簡單六角形
歷史
Cobalt compounds have been used for centuries to impart a rich blue color to glass, glazes and ceramics.

The element was first isolated by Swedish chemist George Brandt in 1735.

He showed it was the presence of the element cobalt that caused the blue color in glass, not bismuth as previously thought.
每個外殼的電子
2, 8, 15, 2
電子排布
[Ar] 3d7 4s2
Co
Supplemental colbalt is essential in sheep's diets to improve the wools quality
物理性質
物態
固體
密度
8.86 g/cm3
熔點
1768.15 K | 1495 °C | 2723 °F
沸點
3200.15 K | 2927 °C | 5300.6 °F
熔化熱
16.2 kJ/mol
汽化熱
375 kJ/mol
比熱容
0.421 J/g·K
地殼豐度
0.003%
宇宙豐度
0.0003%
Pure
圖片來源: Wikimedia Commons (Alchemist-hp)
Pure cobalt chips, electrolytically refined, as well as a high purity cobalt cube for comparison
CAS 編號
7440-48-4
Pubchem CID 編號
104730
原子性質
原子半徑
125 pm
共價半徑
126 pm
電負性
1.88 (鲍林标度)
電離電位
7.881 eV
原子體積
6.7 cm3/mol
熱導率
1 W/cm·K
氧化態
-1, 1, 2, 3, 4, 5
應用
Cobalt is used in the preparation of magnetic, wear-resistant and high-strength alloys.

Cobalt is widely used in batteries and in electroplating.

Radioactive 60Co is used in the treatment of cancer.

A solution of the chloride is used as a sympathetic ink.
Cobalt and its compounds are considered to be slightly toxic
同位素
穩定同位素
59Co
不穩定同位素
47Co, 48Co, 49Co, 50Co, 51Co, 52Co, 53Co, 54Co, 55Co, 56Co, 57Co, 58Co, 60Co, 61Co, 62Co, 63Co, 64Co, 65Co, 66Co, 67Co, 68Co, 69Co, 70Co, 71Co, 72Co, 73Co, 74Co, 75Co