コバルト
27
Co
族
9
周期
4
ブロック
d
陽子
電子
中性子
27
27
32
一般特性
原子番号
27
原子量
58.933195
質量数
59
カテゴリ
遷移元素
色
灰色
放射性
いいえ
From the German word Kobald, goblin or evil spirit; also from the Greek cobalos, mine
結晶構造
六方最密構造
歴史
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.
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.
電子殻
2, 8, 15, 2
電子配置
[Ar] 3d7 4s2
Supplemental colbalt is essential in sheep's diets to improve the wools quality
物理特性
相
固体
密度
8.86 g/㎝3
融点
1768.15 K | 1495 °C | 2723 °F
沸点
3200.15 K | 2927 °C | 5300.6 °F
融解熱
16.2 kJ/mol
蒸発熱
375 kJ/mol
熱容量
0.421 J/g·K
地殻中における存在比
0.003%
宇宙空間における存在比
0.0003%
画像の出典: Wikimedia Commons (Alchemist-hp)
Pure cobalt chips, electrolytically refined, as well as a high purity cobalt cube for comparison
CAS登録番号
7440-48-4
PubChem CID番号
104730
原子特性
原子半径
125 pm
共有結合半径
126 pm
電気陰性度
1.88 (ポーリングの値)
イオン化エネルギー
7.881 eV
モル体積
6.7 ㎝3/mol
熱伝導率
1 W/㎝·K
酸化数
-1, 1, 2, 3, 4, 5
用途
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 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
同位体
安定同位体
59Co不安定同位体
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