Beryllium vs Arsenic
| Property | Be Beryllium | As Arsenic |
|---|---|---|
| Atomic number | 4 | 33 |
| Symbol | Be | As |
| Name | Beryllium | Arsenic |
| Category | alkaline-earth-metal | metalloid |
| Standard Atomic Weight | 9.012183 u | 74.921595 u |
| Period | 2 | 4 |
| Group | 2 | 15 |
| Block | s | p |
| Phase at STP | solid | solid |
| Electron configuration | [He]2s2 | [Ar]4s23d104p3 |
| Oxidation states | [0, 1, 2] | [-3, -2, -1, 0, 1, 2, 3, 4, 5] |
| Electronegativity (Pauling) | 1.57 | 2.18 |
| Electron affinity | -0.52 eV | 0.81 eV |
| Density | 1850 kg/m³ | 5776 kg/m³ |
| Melting point | 1286.85 °C | 816.85 °C |
| Boiling point | 2470.85 °C | 613.85 °C |
| Discovery year | 1797 | 1250 |