Selenium vs Iridium
| Property | Se Selenium | Ir Iridium |
|---|---|---|
| Atomic number | 34 | 77 |
| Symbol | Se | Ir |
| Name | Selenium | Iridium |
| Category | nonmetal | transition-metal |
| Standard Atomic Weight | 78.971 u | 192.217 u |
| Period | 4 | 6 |
| Group | 16 | 9 |
| Block | p | s |
| Phase at STP | solid | solid |
| Electron configuration | [Ar]4s23d104p4 | [Xe]6s24f145d7 |
| Oxidation states | [-2, -1, 0, 1, 2, 3, 4, 5, 6] | [-3, -2, -1, 1, 2, 3, 4, 5, 6, 7, 8, 9] |
| Electronegativity (Pauling) | 2.55 | 2.2 |
| Electron affinity | 2.0206 eV | 1.565 eV |
| Density | 4809 kg/m³ | 2.256220e+4 kg/m³ |
| Melting point | 220.5 °C | 2445.85 °C |
| Boiling point | 684.85 °C | 4427.85 °C |
| Discovery year | 1817 | 1803 |