Manganese

Latin nameManganum
English nameManganese
chemical symbolMn
atomic number25
relative atomic mass54,93805
period4
groupVII.B
classificationtransition metals
discovery year1774
discovererC. W. Sheele
T. O. Bergman
melting point [°C]1244
boiling point [°C]2061
density [g cm-3]7,43
density at melting point [g cm-3]5,95
electronegativity [Pauling]1,55
stand. el. potential [V]−1,18
oxidation statesI ˜ VII
electron configuration[Ar]3d5 4s2
atomic radius [pm]161
covalent radius [pm]139
specific heat [J g-1K-1]0,48
heat of fusion [kJ mol-1]12,05
thermal conductivity [W m-1 K-1]7,81
el. conductivity [S m-1]6,2.105
1. ionizing potential [eV]7,434
2. ionizing potential [eV]15,64
3. ionizing potential [eV]33,667
Mohs hardness6
Vickers hardness [MPa] -
Brinell hardness [MPa]196
point of superconductivity [K] -
Young's modulus [GPa]198
state at normal conditionssolid

Manganese is a gray-white and very brittle metallic element.

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