Chlorine vs Argon
Side-by-side comparison of Chlorine (Cl, element 17) and Argon (Ar, element 18) by atomic structure and physical properties.
| Property | Cl Chlorine | Ar Argon |
|---|---|---|
| Atomic number | 17 | 18 |
| Symbol | Cl | Ar |
| Name | Chlorine | Argon |
| Category | halogen | noble-gas |
| Standard Atomic Weight | 35.4515 u | 39.948 u |
| Period | 3 | 3 |
| Group | 17 | 18 |
| Block | p | p |
| Phase at STP | Gas | Gas |
| Electron configuration | [Ne]3s23p5 | [Ne]3s23p6 |
| Oxidation states | [-1, 1, 2, 3, 4, 5, 6, 7] | [0] |
| Electronegativity (Pauling) | 3.16 | N/A |
| Electron affinity | 3.6127 eV | -1 eV |
| Density | 3.214 kg/m³ | 1.7837 kg/m³ |
| Melting point | -101.5 °C | -189.35 °C |
| Boiling point | -34.04 °C | -185.85 °C |
| Discovery year | 1774 | 1894 |
Key Differences
| Property | Cl Chlorine | Ar Argon |
|---|---|---|
| Standard Atomic Weight | 35.4515 u ↓ lower | 39.948 u ↑ higher |
| Density | 3.214 kg/m³ ↑ higher | 1.7837 kg/m³ ↓ lower |
| Melting point | -101.5 °C ↑ higher | -189.35 °C ↓ lower |
| Boiling point | -34.04 °C ↑ higher | -185.85 °C ↓ lower |
| Electron affinity | 3.6127 eV ↑ higher | -1 eV ↓ lower |
| Group | 17 | 18 |
| Category | halogen | noble-gas |
| Electron configuration | [Ne]3s23p5 | [Ne]3s23p6 |
| Discovery year | 1774 | 1894 |