Kobalt

27
Co
Skupina
9
Perioda
4
Blok
d
Protons
Electrons
Neutrons
27
27
32
General Properties
Vrstno število
27
Atomska teža
58,933195
Mass Number
59
Kategorija
Prehodne kovine
Barva
Gray
Radioactive
Ne
From the German word Kobald, goblin or evil spirit; also from the Greek cobalos, mine
Kristalna struktura
Heksagonalna
Zgodovina
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.
Electrons per shell
2, 8, 15, 2
Razporeditev elektronov
[Ar] 3d7 4s2
Co
Supplemental colbalt is essential in sheep's diets to improve the wools quality
Physical Properties
Faza snovi
Trdnina
Gostota
8,86 g/cm3
Tališče
1768,15 K | 1495 °C | 2723 °F
Vrelišče
3200,15 K | 2927 °C | 5300,6 °F
Talilna toplota
16,2 kJ/mol
Izparilna toplota
375 kJ/mol
Toplotna kapaciteta
0,421 J/g·K
Abundance in Earth's crust
0,003%
Abundance in Universe
0,0003%
Pure
Zasluge za slike: 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
Atomski polmer
125 pm
Kovalentni polmer
126 pm
Elektronegativnost
1,88 (Paulingova lestvica)
Ionization Potential
7,881 eV
Atomic Volume
6,7 cm3/mol
Toplotna prevodnost
1 W/cm·K
Oksidacijska stanja
-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
Isotopes
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