Helium vs Flerovium
| Property | He Helium | Fl Flerovium |
|---|---|---|
| Atomic number | 2 | 114 |
| Symbol | He | Fl |
| Name | Helium | Flerovium |
| Category | noble-gas | post-transition-metal |
| Standard Atomic Weight | 4.002602 u | 289 u |
| Period | 1 | 7 |
| Group | 18 | 14 |
| Block | s | p |
| Phase at STP | gas | gas |
| Electron configuration | 1s2 | [Rn] 7s27p2 5f14 6d10(predicted) |
| Oxidation states | [0] | [0, 1, 2, 4, 6] |
| Electronegativity (Pauling) | N/A | N/A |
| Electron affinity | -0.5 eV | -0.5 eV |
| Density | 0.1785 kg/m³ | 9928 kg/m³ |
| Melting point | -272.2 °C | -273.15 °C |
| Boiling point | -268.93 °C | -63.15 °C |
| Discovery year | 1868 | 1998 |