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25
Mn
54.9380
Manganese |
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): solid | |
| 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 6 M HCl: mild, => H2, MnCl2 | Reaction with 6 M HCl: mild, => H2, MnCl2 |
| Reaction with 15 M HNO3: mild, => Mn(NO3)2, NOx | Reaction with 6 M 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 |
