Kobalt

27
Co
Groep
9
Periode
4
Blok
d
Protrone
Elektrone
Neutrone
27
27
32
Algemene Eienskappe
Atoom Nommer
27
Atoommassa
58,933195
Massa Nommer
59
Kategorie
Oorgangsmetale
Kleur
Grys
Radioaktief
Nee
From the German word Kobald, goblin or evil spirit; also from the Greek cobalos, mine
Kristalstruktuur
Eenvoudige seshoekige
Geskiendenis
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.
Elektrone per skil
2, 8, 15, 2
Elektronkonfigurasie
[Ar] 3d7 4s2
Co
Supplemental colbalt is essential in sheep's diets to improve the wools quality
Fisiese Eienskappe
Fase
Soliede
Digtheid
8,86 g/cm3
Smeltpunt
1768,15 K | 1495 °C | 2723 °F
Kookpunt
3200,15 K | 2927 °C | 5300,6 °F
Heat of Fusion
16,2 kJ/mol
Heat of Vaporization
375 kJ/mol
Spesifieke Hitte Kapasiteit
0,421 J/g·K
Oorvloed in die aardkors
0,003%
Oorvloed in die heelal
0,0003%
Pure
Beeld Krediete: Wikimedia Commons (Alchemist-hp)
Pure cobalt chips, electrolytically refined, as well as a high purity cobalt cube for comparison
CAS Nommer
7440-48-4
PubChem CID Nommer
104730
Atomiese Eienskappe
Atoom radius
125 pm
Kovalente Radius
126 pm
Elektronegatiewiteit
1,88 (Pauling scale)
Ionisasie potensiaal
7,881 eV
Atoom volume
6,7 cm3/mol
Termiese geleidingsvermoë
1 W/cm·K
Oksidasiestate
-1, 1, 2, 3, 4, 5
Toepassings
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
Stabiele Isotope
59Co
Onstabiele 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