Helium vs Tennessine
| Property | He Helium | Ts Tennessine |
|---|---|---|
| Atomic number | 2 | 117 |
| Symbol | He | Ts |
| Name | Helium | Tennessine |
| Category | noble-gas | halogen |
| Standard Atomic Weight | 4.002602 u | 294 u |
| Period | 1 | 7 |
| Group | 18 | 17 |
| Block | s | p |
| Phase at STP | gas | solid |
| Electron configuration | 1s2 | [Rn] 7s2 7p5 5f14 6d10(predicted) |
| Oxidation states | [0] | [-1, 1, 3, 5] |
| Electronegativity (Pauling) | N/A | N/A |
| Electron affinity | -0.5 eV | 1.8 eV |
| Density | 0.1785 kg/m³ | 7200 kg/m³ |
| Melting point | -272.2 °C | 549.85 °C |
| Boiling point | -268.93 °C | 609.85 °C |
| Discovery year | 1868 | 2010 |