PERIODIC ELEMENT
Mn (Manganese)

 



Atomic number : 25
Atomic mass : 54.9380 g.mol-1
Electronegativity according to Pauling : 1.5
Density : 7.43g.cm-3 at 20 °C
Melting point : 1247 °C
Boiling point : 2061 °C
Vanderwaals radius : 0.126 nm
Ionic radius : 0.08 (+2) nm ; 0.046 (+7) nm
Isotopes : 7
Electronic shell : [Ar] 3d5 4s2
Energy of first ionisation : 716 kJ.mol-1
Energy of second ionisation : 1489 kJ.mol-1
Standard Potential : - 1.05 V (Mn2+ / Mn)
Discovered by : Johann Gahn in 1774
 
Atomic Structure Uses (Steel, batteries, ceramics)