In detail

Cobalt (Co) properties


Atomic mass, symbol and atomic number

cobalt is a naturally occurring element with the element symbol Co and the atomic number 27. In the periodic table it stands with an atomic mass of 58,933 u in the 8th subgroup. The chemical element discovered by Georg Brandt in 1735 is not radioactive and is in a solid state of aggregation at room temperature.

Profile: Cobalt (Cobalt)

General
Chemical element:cobalt
Symbol:Co
Atomic number:27
Group:cobalt group
Period:4
Block:d-block
Series:Transition metals
Appearance:black-gray
explorers:Georg Brandt
Year of discovery:1735
Atomic properties
Atomic mass:58,933 u
Atomic radius:135 pm
Covalent radius:126 pm
Van der Waals radius:unknown
Electron configuration:Ar 4s2 3d7
ionization:760.4 kJ / mol
Physical Properties
Physical state:firmly
Density:???
Crystal structure:hexagonal
Magnetism:ferromagnetic
molar volume:6,67 · 10-6 m3/ mol
Mohs hardness:5,0
Melting point:1495 ° C
Boiling point:2900 ° C
Heat of fusion:16.2 kJ / mol
Heat of vaporization:390 kJ / mol
Thermal conductivity:100W
Chemical properties
electronegativity:1,88

Did you know that ...

  • Cobalt oxides were used as a blue dye in the past?
  • promotes the Democratic Republic of the Congo world's most cobalt?
  • the important vitamin B for humans12 Cobalt contains? (C62H88CoN13O14P)
  • the name of the element can be derived from "goblin"?