Beryllium vs Oxygen
| Property | Be Beryllium | O Oxygen |
|---|---|---|
| Atomic number | 4 | 8 |
| Symbol | Be | O |
| Name | Beryllium | Oxygen |
| Category | alkaline-earth-metal | nonmetal |
| Standard Atomic Weight | 9.012183 u | 15.9994 u |
| Period | 2 | 2 |
| Group | 2 | 16 |
| Block | s | p |
| Phase at STP | solid | gas |
| Electron configuration | [He]2s2 | [He]2s22p4 |
| Oxidation states | [0, 1, 2] | [-2, -1, 0, 1, 2] |
| Electronegativity (Pauling) | 1.57 | 3.44 |
| Electron affinity | -0.52 eV | 1.4611 eV |
| Density | 1850 kg/m³ | 1.429 kg/m³ |
| Melting point | 1286.85 °C | -218.79 °C |
| Boiling point | 2470.85 °C | -182.95 °C |
| Discovery year | 1797 | 1771 |