Yttrium vs Mendelevium
| Property | Y Yttrium | Md Mendelevium |
|---|---|---|
| Atomic number | 39 | 101 |
| Symbol | Y | Md |
| Name | Yttrium | Mendelevium |
| Category | transition-metal | actinide |
| Standard Atomic Weight | 88.90584 u | 258 u |
| Period | 5 | 7 |
| Group | 3 | N/A |
| Block | s | s |
| Phase at STP | solid | solid |
| Electron configuration | [Kr]5s24d1 | [Rn]7s25f13 |
| Oxidation states | [0, 1, 2, 3] | [2, 3] |
| Electronegativity (Pauling) | 1.22 | 1.3 |
| Electron affinity | 0.307 eV | 0.997 eV |
| Density | 4470 kg/m³ | 1.030000e+4 kg/m³ |
| Melting point | 1521.85 °C | 826.85 °C |
| Boiling point | 3344.85 °C | -273.15 °C |
| Discovery year | 1794 | 1955 |