Beryllium vs Argon
| Property | Be Beryllium | Ar Argon |
|---|---|---|
| Atomic number | 4 | 18 |
| Symbol | Be | Ar |
| Name | Beryllium | Argon |
| Category | alkaline-earth-metal | noble-gas |
| Standard Atomic Weight | 9.012183 u | 39.948 u |
| Period | 2 | 3 |
| Group | 2 | 18 |
| Block | s | p |
| Phase at STP | solid | gas |
| Electron configuration | [He]2s2 | [Ne]3s23p6 |
| Oxidation states | [0, 1, 2] | [0] |
| Electronegativity (Pauling) | 1.57 | N/A |
| Electron affinity | -0.52 eV | -1 eV |
| Density | 1850 kg/m³ | 1.7837 kg/m³ |
| Melting point | 1286.85 °C | -189.35 °C |
| Boiling point | 2470.85 °C | -185.85 °C |
| Discovery year | 1797 | 1894 |