Atomic number: 25
Atomic mass: 54.938045
Number of Protons/Electrons: 25
Number of Neutrons: 30
Isotope
Half Life
Mn-52
5.59 days
Mn-52m
21.1 minutes
Mn-53
3700000.0 years
Mn-54
312.2 days
Mn-55
Stable
Mn-56
2.57 hours
Mn-57
1.45 minutes

Date of Discovery: 1774
Discoverer: Johann Gahn
Name Origin: From the Latin word mangnes (magnet)
Physical Properties:Manganese is a steel-gray, hard, shiny, brittle metal.
Chemical Properties of Manganese:
Electrochemical Equivalent: 0.29282g/amp-hr
Electron Work Function: 4.1eV
Electronegativity: 1.55 (Pauling); 1.6 (Allrod
At higher temperatures, it reacts more rapidly. It may even burn, giving off a bright white light. Manganese reacts slowly with cold water, but more rapidly with hot water or steam. It dissolves in most acids with the release of hydrogen gas. Manganese is reactive when pure, and as a powder it will burn in oxygen, it reacts with water (it rusts like iron) and dissolves in dilute acids.

Melting Point: 1519 K (1246°C or 2275°F)
Boiling Point: 2334 K (2061°C or 3742°F)
Phase at Room Temperature: Solid
US $0.0023/gram
Physical Properties.
Mass Number:
54.93805 amu
Electron Configuration:
[Ar]3d54s2
Ionization Energy:
First: 717

Second: 1509

Third: 3248

Chemical Properties
Heat of Fusion: 12.05kJ/mol
Incompatibilities:
Oxidizers
Ionization Potential
First: 7.435
Second: 15.64
Third: 33.667
Valence Electron Potential (-eV): 220

Manganese dioxide is used to make clear glass. Normal silica glass is tinted