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|
Manganese
Chemical Properties & Compounds
| Symbol | Atomic Number | Atomic Weight | Melting Point | Boiling Point | Phase | Density | Classification |
| Mn | 25 | 54.938045 | 1246 °C | 2061 °C | Solid | 7.43 g/cm3 | Metal  |
|
|
|
| General |
| Name, symbol, number |
manganese, Mn, 25 |
| Chemical series |
transition metals |
| Group, period, block |
7, 4, d |
| Appearance |
silvery metallic
 |
| Standard atomic weight |
54.938045(5) g·mol−1 |
| Electron configuration |
[Ar] 4s2 3d5 |
| Electrons per shell |
2, 8, 15 |
| Physical properties |
| Phase |
solid |
| Density (near r.t.) |
7.21 g·cm−3 |
| Liquid density at m.p. |
5.95 g·cm−3 |
| Melting point |
1519 K
(1246 °C, 2275 °F) |
| Boiling point |
2334 K
(2061 °C, 3742 °F) |
| Heat of fusion |
12.91 kJ·mol−1 |
| Heat of vaporization |
221 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 structure |
cubic A12 |
| Oxidation states |
7, 6, 4, 2, 3
(oxides: acidic, basic or amphoteric
depending on the oxidation state) |
| Electronegativity |
1.55 (Pauling scale) |
Ionization energies
(more) |
1st: 717.3 kJ·mol−1 |
| 2nd: 1509.0 kJ·mol−1 |
| 3rd: 3248 kJ·mol−1 |
| Atomic radius |
140 pm |
| Atomic radius (calc.) |
161 pm |
| Covalent radius |
139 pm |
| Miscellaneous |
| Magnetic ordering |
paramagnetic |
| 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 modulus |
198 GPa |
| Bulk modulus |
120 GPa |
| Mohs hardness |
6.0 |
| Brinell hardness |
196 MPa |
| CAS registry number |
7439-96-5 |
| Selected isotopes |
|
|
| References |
|
Manganese Compounds
|
Source: Wikipedia article Manganese
|
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Chemistry Quick Facts
