Oxygen vs Mendelevium
| Property | O Oxygen | Md Mendelevium |
|---|---|---|
| Atomic number | 8 | 101 |
| Symbol | O | Md |
| Name | Oxygen | Mendelevium |
| Category | nonmetal | actinide |
| Standard Atomic Weight | 15.9994 u | 258 u |
| Period | 2 | 7 |
| Group | 16 | N/A |
| Block | p | s |
| Phase at STP | gas | solid |
| Electron configuration | [He]2s22p4 | [Rn]7s25f13 |
| Oxidation states | [-2, -1, 0, 1, 2] | [2, 3] |
| Electronegativity (Pauling) | 3.44 | 1.3 |
| Electron affinity | 1.4611 eV | 0.997 eV |
| Density | 1.429 kg/m³ | 1.030000e+4 kg/m³ |
| Melting point | -218.79 °C | 826.85 °C |
| Boiling point | -182.95 °C | -273.15 °C |
| Discovery year | 1771 | 1955 |