Kobolt

27
Co
Grupp
9
Period
4
Block
d
Protoner
Electrons
Neutroner
27
27
32
Generella Egenskaper
Atomnummer
27
Atommassa
58,933195
Mass Number
59
Kategori
Övergångsmetaller
Färg
Grå
Radioaktiv
Nej
From the German word Kobald, goblin or evil spirit; also from the Greek cobalos, mine
Kristallstruktur
Enkelt hexagonalt
Historia
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 per skal
2, 8, 15, 2
Elektronkonfiguration
[Ar] 3d7 4s2
Co
Supplemental colbalt is essential in sheep's diets to improve the wools quality
Fysikaliska Egenskaper
Aggregationstillstånd
Fast
Densitet
8,86 g/cm3
Smältpunkt
1768,15 K | 1495 °C | 2723 °F
Kokpunkt
3200,15 K | 2927 °C | 5300,6 °F
Smältvärme
16,2 kJ/mol
Ångbildningsvärme
375 kJ/mol
Specifik värmekapacitet
0,421 J/g·K
Abundance in Earth's crust
0,003%
Abundance in Universe
0,0003%
Pure
Bildkrediter: 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
Atomära Egenskaper
Atomradie
125 pm
Kovalent radie
126 pm
Elektronegativitet
1,88 (Paulingskalan)
Jonisationspotential
7,881 eV
Molvolym
6,7 cm3/mol
Värmeledningsförmåga
1 W/cm·K
Oxidationstillstånd
-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
Stabila isotoper
59Co
Instabila isotoper
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