| General |
|---|
| Name | Beryllium | | Symbol | Be | | Number | 4 | | Chemical series | Alkaline earth metals | | Group / Period | 2 / 2 | | Block | s-block | | CAS registry number | 7440-41-7 |
| Physical properties |
|---|
| State | solid | | Density | 1.85 g/cm3 | | Melting point | 1560 K (1287 °C, 2349 °F) | | Boiling point | 2742 K (2469 °C, 4476 °F) | | Critical point | |
| Atomic properties |
|---|
| Atomic Weight | 9.012182 g/mol | | Crystal structure | hexagonal | | Electronegativity | 1.57 | | Atomic radius | 105 pm | | Atomic radius (calculated) | 112 pm | | Electron configuration | [He] 2s2 | | Electrons per shell | 2, 2 | | Number of protons | 4 | | Number of neutrons | 5 |
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Boron