Template:Infobox manganese

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25 chromiummanganeseiron
-

Mn

Tc
General
Name, symbol, number manganese, Mn, 25
Chemical seriestransition metals
Group, period, block 74, d
Appearancesilvery metallic
Image:Mn,25.jpg
Standard atomic weight 54.938045(5) g·mol−1
Electron configuration [Ar] 4s2 3d5
Electrons per shell 2, 8, 15
Physical properties
Phasesolid
Density (near r.t.)7.21 g·cm−3
Liquid density at m.p.5.95 g·cm−3
Melting point1519 K
(1246 °C, 2275 °F)
Boiling point2334 K
(2061 °C, 3742 °F)
Heat of fusion12.91 kJ·mol−1
Heat of vaporization221 kJ·mol−1
Heat capacity(25 °C) 26.32 J·mol−1·K−1
Vapor pressure
P/Pa 1 10 100 1 k 10 k 100 k
at T/K 1228 1347 1493 1691 1955 2333
Atomic properties
Crystal structurecubic A12
Oxidation states7, 6, 4, 2, 3
(oxides: acidic, basic or amphoteric
depending on the oxidation state)
Electronegativity1.55 (Pauling scale)
Ionization energies
(more)
1st: 717.3 kJ·mol−1
2nd: 1509.0 kJ·mol−1
3rd: 3248 kJ·mol−1
Atomic radius140 pm
Atomic radius (calc.)161 pm
Covalent radius139 pm
Miscellaneous
Magnetic orderingparamagnetic
Electrical resistivity(20 °C) 1.44 µΩ·m
Thermal conductivity(300 K) 7.81 W·m−1·K−1
Thermal expansion(25 °C) 21.7 µm·m−1·K−1
Speed of sound (thin rod)(20 °C) 5150 m/s
Young's modulus198 GPa
Bulk modulus120 GPa
Mohs hardness6.0
Brinell hardness196 MPa
CAS registry number7439-96-5
Selected isotopes
Main article: Isotopes of manganese
iso NA half-life DM DE (MeV) DP
52Mn syn 5.591 d ε - 52Cr
β+ 0.575 52Cr
γ 0.7, 0.9, 1.4 -
53Mn syn 3.74 ×106 y ε - 53Cr
54Mn syn 312.3 d ε - 54Cr
γ 0.834 -
55Mn 100% Mn is stable with 30 neutrons
References
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