Kobolt
27
Co
Gruppe
9
Periode
4
Blokk
d
Protons
Electrons
Neutrons
27
27
32
Generelle eigenskapar
Atomnummer
27
Atommasse
58,933195
Mass Number
59
Kategori
Transisjonsmetall
Farge
Grå
Radioactive
Nei
From the German word Kobald, goblin or evil spirit; also from the Greek cobalos, mine
Krystallstruktur
Simple Hexagonal
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.
Elektron per energinivå
2, 8, 15, 2
Elektronkonfigurasjon
[Ar] 3d7 4s2
Supplemental colbalt is essential in sheep's diets to improve the wools quality
Fysiske eigenskapar
Tilstandsform
Fast stoff
Tettleik
8,86 g/cm3
Smeltepunkt
1768,15 K | 1495 °C | 2723 °F
Kokepunkt
3200,15 K | 2927 °C | 5300,6 °F
Smeltevarme
16,2 kJ/mol
Fordampingsvarme
375 kJ/mol
Spesifikk varmekapasitet
0,421 J/g·K
Abundance in Earth's crust
0,003%
Abundance in Universe
0,0003%
Image Credits: 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
Atom eigenskapar
Atomradius
125 pm
Kovalent radius
126 pm
Elektronegativitet
1,88 (Paulings skala)
Ioniseringspotensial
7,881 eV
Molart volum
6,7 cm3/mol
Termisk konduktivitet
1 W/cm·K
Oksidasjonstrinn
-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 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
Isotopes
Stable Isotopes
59CoUnstable 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