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|
Chromium
Chemical Properties & Compounds
| Symbol | Atomic Number | Atomic Weight | Melting Point | Boiling Point | Phase | Density | Classification |
| Cr | 24 | 51.9961 | 1907 °C | 2671 °C | Solid | 7.15 g/cm3 | Metal  |
|
|
|
| General |
| Name, symbol, number |
chromium, Cr, 24 |
| Chemical series |
transition metals |
| Group, period, block |
6, 4, d |
| Appearance |
silvery metallic
 |
| Standard atomic weight |
51.9961(6) g·mol−1 |
| Electron configuration |
[Ar] 3d5 4s1 |
| Electrons per shell |
2, 8, 13, 1 |
| Physical properties |
| Phase |
solid |
| Density (near r.t.) |
7.15 g·cm−3 |
| Liquid density at m.p. |
6.3 g·cm−3 |
| Melting point |
2180 K
(1907 °C, 3465 °F) |
| Boiling point |
2944 K
(2671 °C, 4840 °F) |
| Heat of fusion |
21.0 kJ·mol−1 |
| Heat of vaporization |
339.5 kJ·mol−1 |
| Heat capacity |
(25 °C) 23.35 J·mol−1·K−1 |
Vapor pressure
| P/Pa |
1 |
10 |
100 |
1 k |
10 k |
100 k |
| at T/K |
1656 |
1807 |
1991 |
2223 |
2530 |
2942 |
|
| Atomic properties |
| Crystal structure |
cubic body centered |
| Oxidation states |
6, 4, 3, 2
(strongly acidic oxide) |
| Electronegativity |
1.66 (Pauling scale) |
Ionization energies
(more) |
1st: 652.9 kJ·mol−1 |
| 2nd: 1590.6 kJ·mol−1 |
| 3rd: 2987 kJ·mol−1 |
| Atomic radius |
140 pm |
| Atomic radius (calc.) |
166 pm |
| Covalent radius |
127 pm |
| Miscellaneous |
| Magnetic ordering |
AFM (rather: SDW) |
| Electrical resistivity |
(20 °C) 125 nΩ·m |
| Thermal conductivity |
(300 K) 93.9 W·m−1·K−1 |
| Thermal expansion |
(25 °C) 4.9 µm·m−1·K−1 |
| Speed of sound (thin rod) |
(20 °C) 5940 m/s |
| Young's modulus |
279 GPa |
| Shear modulus |
115 GPa |
| Bulk modulus |
160 GPa |
| Poisson ratio |
0.21 |
| Mohs hardness |
8.5 |
| Vickers hardness |
1060 MPa |
| Brinell hardness |
1120 MPa |
| CAS registry number |
7440-47-3 |
| Selected isotopes |
|
|
| References |
|
Chromium Compounds
|
Source: Wikipedia article Chromium
|
|
Chemistry Quick Facts
