In detail

Manganese (Mn) properties


Atomic mass, symbol and atomic number

manganese is a naturally occurring element with the element symbol Mn and atomic number 25. In the periodic table it stands with an atomic mass of 54,938 u in the 7th subgroup. The chemical element discovered by Johan Gottlieb Gahn in 1774 is not radioactive and is in a solid state of aggregation at room temperature.

Profile: Manganese (Manganese)

General
Chemical element:manganese
Symbol:Mn
Atomic number:25
Group:Manga group
Period:4
Block:d-block
Series:Transition metals
Appearance:silver
explorers:Johan Gottlieb Gahn
Year of discovery:1774
Atomic properties
Atomic mass:54,938 u
Atomic radius:140 pm
Covalent radius:139 pm
Van der Waals radius:unknown
Electron configuration:Ar 4s2 3d5
ionization:717.3 kJ / mol
Physical Properties
Physical state:firmly
Density:???
Crystal structure:???
Magnetism:paramagnetic
molar volume:7,35 · 10-6 m3/ mol
Mohs hardness:6,0
Melting point:1246 ° C
Boiling point:2100 ° C
Heat of fusion:13.2 kJ / mol
Heat of vaporization:225 kJ / mol
Thermal conductivity:7.8 W
Chemical properties
electronegativity:1,55

Did you know that ...

  • Manganese oxides were already used in the Stone Age as a dye for cave paintings?
  • Manganese can be extracted from brownstone?
  • in the photosynthesis of plants small amounts of manganese are needed?
  • pure, powdery manganese is highly flammable?