Phosphorus vs Arsenic
Pick up to 3 elements and see how they stack up.
| Property | Phosphorus | Arsenic |
|---|---|---|
| Atomic number | 15 | 33 |
| Atomic mass | 30.974 | 74.922 |
| Electronegativity | 2.19 | 2.18 |
| Melting point | 317.3 K (44.2 °C) | 1,090 K (816.8 °C) |
| Boiling point | 553.7 K (280.6 °C) | 887 K (613.8 °C) |
| Density | 1.823 g/cm³ | 5.727 g/cm³ |
| Atomic radius | 180 pm | 185 pm |
| Ionization energy | 10.487 eV | 9.815 eV |
| Discovered | 1669 | 1250 |
| Category | Reactive nonmetal | Metalloid |
| State at room temp. | Solid | Solid |
| Block | p | p |
| Group | 15 | 15 |
| Period | 3 | 4 |
| Valence electrons | 5 | 5 |
| Common charges | −3 | −3 |
| Electron configuration | [Ne] 3s2 3p3 | [Ar] 3d10 4s2 4p3 |