Hydrogen vs Neptunium
| Property | H Hydrogen | Np Neptunium |
|---|---|---|
| Atomic number | 1 | 93 |
| Symbol | H | Np |
| Name | Hydrogen | Neptunium |
| Category | nonmetal | actinide |
| Standard Atomic Weight | 1.007975 u | 237 u |
| Period | 1 | 7 |
| Group | 1 | N/A |
| Block | s | s |
| Phase at STP | gas | solid |
| Electron configuration | 1s1 | [Rn]7s25f46d1 |
| Oxidation states | [-1, 1] | [2, 3, 4, 5, 6, 7] |
| Electronegativity (Pauling) | 2.2 | 1.36 |
| Electron affinity | 0.75419 eV | 0.48 eV |
| Density | 0.08988 kg/m³ | 2.025000e+4 kg/m³ |
| Melting point | -259.34 °C | 643.85 °C |
| Boiling point | -252.87 °C | 3901.85 °C |
| Discovery year | 1766 | 1940 |