Cobalt
27
Co
Grup
9
Període
4
Bloc
d
Protons
Electrons
Neutrons
27
27
32
Propietats Generals
Nombre atòmic
27
Massa atòmica
58,933195
Nombre de massa
59
Categoria
Metalls de transició
Color
Gris
Radioactiu
No
From the German word Kobald, goblin or evil spirit; also from the Greek cobalos, mine
Estructura cristal·lina
Hexàgon simple
Història
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.
Electrons per capa
2, 8, 15, 2
Configuració electrònica
[Ar] 3d7 4s2
Supplemental colbalt is essential in sheep's diets to improve the wools quality
Propietats Físiques
Fase
Sòlid
Densitat
8,86 g/cm3
Punt de fusió
1768,15 K | 1495 °C | 2723 °F
Punt d'ebullició
3200,15 K | 2927 °C | 5300,6 °F
Entalpia de fusió
16,2 kJ/mol
Entalpia de vaporització
375 kJ/mol
Capacitat tèrmica específica
0,421 J/g·K
Abundància a l'escorça terrestre
0,003%
Abundància a l'univers
0,0003%
Crèdits de les imatges: Wikimedia Commons (Alchemist-hp)
Pure cobalt chips, electrolytically refined, as well as a high purity cobalt cube for comparison
Número CAS
7440-48-4
Número CID de PubChem
104730
Propietats Atòmiques
Radi atòmic
125 pm
Radi covalent
126 pm
Electronegativitat
1,88 (Escala de Pauling)
Potencial d'ionització
7,881 eV
Volum atòmic
6,7 cm3/mol
Conductivitat tèrmica
1 W/cm·K
Estats d'oxidació
-1, 1, 2, 3, 4, 5
Aplicacions
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
Isòtops
Isòtops estables
59CoIsòtops inestables
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