Kobolt

27
Co
Gruppe
9
Periode
4
Blok
d
Protons
Electrons
Neutrons
27
27
32
General Properties
Atomnummer
27
Atommasse
58,933195
Mass Number
59
Kategori
Overgangsmetaller
Farve
Grå
Radioactive
Nej
From the German word Kobald, goblin or evil spirit; also from the Greek cobalos, mine
Krystalstruktur
Simpel Hexagonal
History
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.
Elektroner i hver skal
2, 8, 15, 2
Elektronkonfiguration
[Ar] 3d7 4s2
Co
Supplemental colbalt is essential in sheep's diets to improve the wools quality
Physical Properties
Tilstandsform
Fast stof
Massefylde
8,86 g/cm3
Smeltepunkt
1768,15 K | 1495 °C | 2723 °F
Kogepunkt
3200,15 K | 2927 °C | 5300,6 °F
Smeltevarme
16,2 kJ/mol
Fordampningsvarme
375 kJ/mol
Varmefylde
0,421 J/g·K
Abundance in Earth's crust
0,003%
Abundance in Universe
0,0003%
Pure
Billede akkrediteringer: Wikimedia Commons (Alchemist-hp)
Pure cobalt chips, electrolytically refined, as well as a high purity cobalt cube for comparison
CAS Number
7440-48-4
PubChem CID Number
104730
Atomic Properties
Atomradius
125 pm
Kovalent radius
126 pm
Elektronegativitet
1,88 (Paulings skala)
Ionization Potential
7,881 eV
Atomic Volume
6,7 cm3/mol
Varmeledningsevne
1 W/cm·K
Oxidationstrin
-1, 1, 2, 3, 4, 5
Applications
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
Isotoper
Stable Isotopes
59Co
Unstable Isotopes
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