Chlorine vs Calcium
| Property | Cl Chlorine | Ca Calcium |
|---|---|---|
| Atomic number | 17 | 20 |
| Symbol | Cl | Ca |
| Name | Chlorine | Calcium |
| Category | halogen | alkaline-earth-metal |
| Standard Atomic Weight | 35.4515 u | 40.078 u |
| Period | 3 | 4 |
| Group | 17 | 2 |
| Block | p | s |
| Phase at STP | gas | solid |
| Electron configuration | [Ne]3s23p5 | [Ar]4s2 |
| Oxidation states | [-1, 1, 2, 3, 4, 5, 6, 7] | [1, 2] |
| Electronegativity (Pauling) | 3.16 | 1 |
| Electron affinity | 3.6127 eV | 0.0245 eV |
| Density | 3.214 kg/m³ | 1540 kg/m³ |
| Melting point | -101.5 °C | 841.85 °C |
| Boiling point | -34.04 °C | 1483.85 °C |
| Discovery year | 1774 | 1808 |