Cobalt

27
Co
Gruppe
9
Periode
4
Block
d
Protonen
Elektronen
Neutronen
27
27
32
Generelle Eigenschaften
Ordnungszahl
27
Atommasse
58,933195
Massenzahl
59
Kategorie
Übergangsmetalle
Farbe
Grau
Radioaktiv
Nein
From the German word Kobald, goblin or evil spirit; also from the Greek cobalos, mine
Kristallstruktur
Einfach hexagonal
Geschichte
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.
Elektronen pro Schale
2, 8, 15, 2
Elektronenkonfiguration
[Ar] 3d7 4s2
Co
Supplemental colbalt is essential in sheep's diets to improve the wools quality
Physikalische Eigenschaften
Aggregatzustand
Fest
Dichte
8,86 g/cm3
Schmelzpunkt
1768,15 K | 1495 °C | 2723 °F
Siedepunkt
3200,15 K | 2927 °C | 5300,6 °F
Schmelzwärme
16,2 kJ/mol
Verdampfungswärme
375 kJ/mol
Spezifische Wärmekapazität
0,421 J/g·K
Häufigkeit in der Erdkruste
0,003%
Häufigkeit im Universum
0,0003%
Pure
Danksagungen für Bilder: Wikimedia Commons (Alchemist-hp)
Pure cobalt chips, electrolytically refined, as well as a high purity cobalt cube for comparison
CAS-Nummer
7440-48-4
PubChem CID Number
104730
Atomeigenschaften
Atomradius
125 pm
Kovalenter Radius
126 pm
Elektronegativität
1,88 (Pauling-Skala)
Ionisierungsenergie
7,881 eV
Molares Volumen
6,7 cm3/mol
Wärmeleitfähigkeit
1 W/cm·K
Oxidationszustände
-1, 1, 2, 3, 4, 5
Anwendung
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
Isotope
Stabile Isotope
59Co
Instabile Isotope
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