Кобалт

27
Co
Група
9
Периода
4
блок
d
Protons
Electrons
Neutrons
27
27
32
Општи Својства
Атомски број
27
Атомска тежина
58,933195
Mass Number
59
Category
Преоден метал
Color
Gray
Radioactive
Не
From the German word Kobald, goblin or evil spirit; also from the Greek cobalos, mine
Кристална структура
Simple 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.
Electrons per shell
2, 8, 15, 2
Електронска конфигурација
[Ar] 3d7 4s2
Co
Supplemental colbalt is essential in sheep's diets to improve the wools quality
Физички Својства
Фаза
Solid
Густина
8,86 g/cm3
Точка на топење
1768,15 K | 1495 °C | 2723 °F
Точка на вриење
3200,15 K | 2927 °C | 5300,6 °F
Топлина на топење
16,2 kJ/mol
Топлина на испарување
375 kJ/mol
Specific Heat Capacity
0,421 J/g·K
Abundance in Earth's crust
0,003%
Abundance in Universe
0,0003%
Pure
Кредити на слика: 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
Атомски Својства
Атомски полупречник
125 pm
Ковалентен полупречник
126 pm
Електронегативност
1,88 (Полингова скала)
Ionization Potential
7,881 eV
Atomic Volume
6,7 cm3/mol
Thermal Conductivity
1 W/cm·K
Oxidation States
-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