Kobalt
27
Co
Groep
9
Periode
4
Blok
d
Protonen
Elektronen
Neutronen
27
27
32
Algemene Eigenschappen
Atoomnummer
27
Atomair gewicht
58,933195
Massa Getal
59
Categorie
Overgangsmetalen
Kleur
Grijs
Radioactief
Nee
Van het Duitse woord Kobald, kabouter of boze geest; ook van het Griekse cobalos, mijn
Kristalstructuur
Eenvoudige Hexagonaal
Historie
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.
Eletronen per schil
2, 8, 15, 2
Electronconfiguratie
[Ar] 3d7 4s2
Supplemental colbalt is essential in sheep's diets to improve the wools quality
Fysieke Eigenschappen
Fase
Vast
Dichtheid
8,86 g/cm3
Smeltpunt
1768,15 K | 1495 °C | 2723 °F
Kookpunt
3200,15 K | 2927 °C | 5300,6 °F
Fusiewarmte
16,2 kJ/mol
Verdampingswarmte
375 kJ/mol
Specifieke Warmtecapaciteit
0,421 J/g·K
Overvloedig aanwezig in de aardkorst
0,003%
Overvloedig aanwezig in het universum
0,0003%
Verdiensten voor afbeeldingen: 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 nummer
104730
Atoomeigenschappen
Atoomstraal
125 pm
Covalentiestraal
126 pm
Electronegativiteit
1,88 (Pauling schaal)
Ionisatiepotentiaal
7,881 eV
Atoomvolume
6,7 cm3/mol
Thermische geleiding
1 W/cm·K
Oxidatietoestanden
-1, 1, 2, 3, 4, 5
Toepassingen
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
Isotopen
Stabiele isotopen
59CoInstabiele isotopen
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