Helium vs Palladium
| Property | He Helium | Pd Palladium |
|---|---|---|
| Atomic number | 2 | 46 |
| Symbol | He | Pd |
| Name | Helium | Palladium |
| Category | noble-gas | transition-metal |
| Standard Atomic Weight | 4.002602 u | 106.42 u |
| Period | 1 | 5 |
| Group | 18 | 10 |
| Block | s | d |
| Phase at STP | gas | solid |
| Electron configuration | 1s2 | [Kr]4d10 |
| Oxidation states | [0] | [1, 2, 3, 4, 5] |
| Electronegativity (Pauling) | N/A | 2.2 |
| Electron affinity | -0.5 eV | 0.557 eV |
| Density | 0.1785 kg/m³ | 1.200000e+4 kg/m³ |
| Melting point | -272.2 °C | 1554.9 °C |
| Boiling point | -268.93 °C | 2962.85 °C |
| Discovery year | 1868 | 1803 |