Arsenic vs Francium
| Property | As Arsenic | Fr Francium |
|---|---|---|
| Atomic number | 33 | 87 |
| Symbol | As | Fr |
| Name | Arsenic | Francium |
| Category | metalloid | alkali-metal |
| Standard Atomic Weight | 74.921595 u | 223 u |
| Period | 4 | 7 |
| Group | 15 | 1 |
| Block | p | s |
| Phase at STP | solid | solid |
| Electron configuration | [Ar]4s23d104p3 | [Rn]7s1 |
| Oxidation states | [-3, -2, -1, 0, 1, 2, 3, 4, 5] | [1] |
| Electronegativity (Pauling) | 2.18 | 0.7 |
| Electron affinity | 0.81 eV | 0.491 eV |
| Density | 5776 kg/m³ | 1870 kg/m³ |
| Melting point | 816.85 °C | 26.85 °C |
| Boiling point | 613.85 °C | -273.15 °C |
| Discovery year | 1250 | 1939 |