Calcium vs Nickel
| Property | Ca Calcium | Ni Nickel |
|---|---|---|
| Atomic number | 20 | 28 |
| Symbol | Ca | Ni |
| Name | Calcium | Nickel |
| Category | alkaline-earth-metal | transition-metal |
| Standard Atomic Weight | 40.078 u | 58.6934 u |
| Period | 4 | 4 |
| Group | 2 | 10 |
| Block | s | s |
| Phase at STP | solid | solid |
| Electron configuration | [Ar]4s2 | [Ar]4s23d8 |
| Oxidation states | [1, 2] | [-2, -1, 0, 1, 2, 3, 4] |
| Electronegativity (Pauling) | 1 | 1.91 |
| Electron affinity | 0.0245 eV | 1.156 eV |
| Density | 1540 kg/m³ | 8912 kg/m³ |
| Melting point | 841.85 °C | 1454.85 °C |
| Boiling point | 1483.85 °C | 2912.85 °C |
| Discovery year | 1808 | 1751 |