Scandium vs Radium
| Property | Sc Scandium | Ra Radium |
|---|---|---|
| Atomic number | 21 | 88 |
| Symbol | Sc | Ra |
| Name | Scandium | Radium |
| Category | transition-metal | alkaline-earth-metal |
| Standard Atomic Weight | 44.955908 u | 226 u |
| Period | 4 | 7 |
| Group | 3 | 2 |
| Block | s | s |
| Phase at STP | solid | solid |
| Electron configuration | [Ar]4s23d1 | [Rn]7s2 |
| Oxidation states | [0, 1, 2, 3] | [2] |
| Electronegativity (Pauling) | 1.36 | 0.9 |
| Electron affinity | 0.188 eV | 0.096 eV |
| Density | 2990 kg/m³ | 5000 kg/m³ |
| Melting point | 1540.85 °C | 699.85 °C |
| Boiling point | 2835.85 °C | 1139.85 °C |
| Discovery year | 1879 | 1898 |