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Manganese

25
Mn
54.9380
Manganese
 General | States | Energies | Oxidation & Electrons | Appearance & Characteristics | Reactions | Other Forms Radius | Conductivity | Abundance

General:

Name: Manganese Symbol: Mn
Group: Trans. Met. Atomic weight: 54.9380
Density @ 293 K: 7.43 g/cm3 Atomic volume: 1.39 cm3/mol
Group: Trans. Met. discovered: 1774

States:

state (s, l, g): s
melting point: 1517.2 K boiling point: 2333 K
Heat of fusion: 12.050 kJ/mol Heat of vaporization: 226.0 kJ/mol

Energies:

1st ionization energy: 717.4 kJ/mole
electronegativity: 1.55 2nd ionization energy: 1509 kJ/mole
electron affinity: kJ/mole 3rd ionization energy: 3248.3 kJ/mole
Specific heat: 0.48 J/gK heat atomization: 281 kJ/mole atoms

Oxidation & Electrons:

Shells: 2,8,13,2 electron configuration: [Ar] 3d5 4s2
minimum oxidation number: -3 maximum oxidation number: 7
min. common oxidation no.: 0 max. common oxidation no.: 7

Appearance & Characteristics:

structure: special:complex (cubic) color: gray-white
uses: steel, dry cells(MnO2) toxicity:
hardness: 5 mohs characteristics: hard, brittle

Reactions:

reaction with air: mild, w/ht =>Mn3O4, Mn3N2
reaction with 6M HCl: mild, =>H2, MnCl2 reaction with 6M HCl: mild, =>H2, MnCl2
reaction with 15M HNO3: mild, =>Mn(NO3)2, NOx reaction with 6M NaOH:

Other Forms:

number of isotopes: 1 hydride(s): none
oxide(s): MnO Mn3O4 Mn2O3 MnO2 Mn2O7 chloride(s): MnCl2

Radius:

ionic radius (2- ion): pm ionic radius (1- ion): pm
atomic radius: 127 pm ionic radius (1+ ion): pm
ionic radius (2+ ion): 89 pm ionic radius (3+ ion): 75.3 pm

Conductivity:

thermal conductivity: 7.81 J/m-sec-deg
electrical conductivity: 5.405 1/mohm-cm polarizability: 9.4 A^3

Abundance:

source: Pyrolusite,psilomelane(oxide)
rel. abund. solar system: 3.980 log abundance earth's crust: 3 log
cost, pure: 1.7 $/100g cost, bulk: $/100g