Phosphorus vs Fermium
| Property | P Phosphorus | Fm Fermium |
|---|---|---|
| Atomic number | 15 | 100 |
| Symbol | P | Fm |
| Name | Phosphorus | Fermium |
| Category | nonmetal | actinide |
| Standard Atomic Weight | 30.973762 u | 257 u |
| Period | 3 | 7 |
| Group | 15 | N/A |
| Block | p | s |
| Phase at STP | solid | solid |
| Electron configuration | [Ne]3s23p3 | [Rn] 5f12 7s2 |
| Oxidation states | [-3, -2, -1, 0, 1, 2, 3, 4, 5] | [2, 3] |
| Electronegativity (Pauling) | 2.19 | 1.3 |
| Electron affinity | 0.7466 eV | 0.339 eV |
| Density | 1820 kg/m³ | 9700 kg/m³ |
| Melting point | 44.15 °C | 1526.85 °C |
| Boiling point | 280.5 °C | -273.15 °C |
| Discovery year | 1669 | 1952 |