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|
Beryllium
Chemical Properties & Compounds
| Symbol | Atomic Number | Atomic Weight | Melting Point | Boiling Point | Phase | Density | Classification |
| Be | 4 | 9.012182 | 1287 °C | 2469 °C | Solid | 1.85 g/cm3 | Alkaline Earth Metal  |
|
|
|
| General |
| Name, symbol, number |
beryllium, Be, 4 |
| Chemical series |
alkaline earth metals |
| Group, period, block |
2, 2, s |
| Appearance |
white-gray metallic
 |
| Standard atomic weight |
9.012182(3) g·mol−1 |
| Electron configuration |
1s2 2s2 |
| Electrons per shell |
2, 2 |
| Physical properties |
| Phase |
solid |
| Density (near r.t.) |
1.85 g·cm−3 |
| Liquid density at m.p. |
1.690 g·cm−3 |
| Melting point |
1560 K
(1287 °C, 2349 °F) |
| Boiling point |
2742 K
(2469 °C, 4476 °F) |
| Heat of fusion |
7.895 kJ·mol−1 |
| Heat of vaporization |
297 kJ·mol−1 |
| Heat capacity |
(25 °C) 16.443 J·mol−1·K−1 |
Vapor pressure
| P/Pa |
1 |
10 |
100 |
1 k |
10 k |
100 k |
| at T/K |
1462 |
1608 |
1791 |
2023 |
2327 |
2742 |
|
| Atomic properties |
| Crystal structure |
hexagonal |
| Oxidation states |
2
(amphoteric oxide) |
| Electronegativity |
1.57 (Pauling scale) |
Ionization energies
(more) |
1st: 899.5 kJ·mol−1 |
| 2nd: 1757.1 kJ·mol−1 |
| 3rd: 14848.7 kJ·mol−1 |
| Atomic radius |
105 pm |
| Atomic radius (calc.) |
112 pm |
| Covalent radius |
90 pm |
| Miscellaneous |
| Magnetic ordering |
diamagnetic |
| Thermal conductivity |
(300 K) 200 W·m−1·K−1 |
| Thermal expansion |
(25 °C) 11.3 µm·m−1·K−1 |
| Speed of sound (thin rod) |
(20 °C) 35.6 n m/s |
| Speed of sound (thin rod) |
(r.t.) 12870 m·s−1 |
| Young's modulus |
287 GPa |
| Shear modulus |
132 GPa |
| Bulk modulus |
130 GPa |
| Poisson ratio |
0.032 |
| Mohs hardness |
5.5 |
| Vickers hardness |
1670 MPa |
| Brinell hardness |
600 MPa |
| CAS registry number |
7440-41-7 |
| Selected isotopes |
|
|
| References |
|
Beryllium Compounds
|
Source: Wikipedia article Beryllium
|
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Chemistry Quick Facts
