Calcium vs Barium
| Property | Ca Calcium | Ba Barium |
|---|---|---|
| Atomic number | 20 | 56 |
| Symbol | Ca | Ba |
| Name | Calcium | Barium |
| Category | alkaline-earth-metal | alkaline-earth-metal |
| Standard Atomic Weight | 40.078 u | 137.327 u |
| Period | 4 | 6 |
| Group | 2 | 2 |
| Block | s | s |
| Phase at STP | solid | solid |
| Electron configuration | [Ar]4s2 | [Xe]6s2 |
| Oxidation states | [1, 2] | [1, 2] |
| Electronegativity (Pauling) | 1 | 0.89 |
| Electron affinity | 0.0245 eV | 0.1447 eV |
| Density | 1540 kg/m³ | 3620 kg/m³ |
| Melting point | 841.85 °C | 726.85 °C |
| Boiling point | 1483.85 °C | 1896.85 °C |
| Discovery year | 1808 | 1808 |