Sodium vs Argon
| Property | Na Sodium | Ar Argon |
|---|---|---|
| Atomic number | 11 | 18 |
| Symbol | Na | Ar |
| Name | Sodium | Argon |
| Category | alkali-metal | noble-gas |
| Standard Atomic Weight | 22.989769 u | 39.948 u |
| Period | 3 | 3 |
| Group | 1 | 18 |
| Block | s | p |
| Phase at STP | solid | gas |
| Electron configuration | [Ne]3s1 | [Ne]3s23p6 |
| Oxidation states | [-1, 0, 1] | [0] |
| Electronegativity (Pauling) | 0.93 | N/A |
| Electron affinity | 0.5479 eV | -1 eV |
| Density | 970 kg/m³ | 1.7837 kg/m³ |
| Melting point | 97.8 °C | -189.35 °C |
| Boiling point | 882.85 °C | -185.85 °C |
| Discovery year | 1807 | 1894 |