Argon
| Basic Information | Crystal Structure | Isotope | Facts | Related Links |
| Symbol: | Ar |
| Atomic Number: | 18 |
| Atomic weight: | 39.948u |
| Melting Point: | 83.81K |
| Boiling Point: | 87.3K |
| Number of Protons/Electrons: | 18 |
| Number of Neutrons: | 22 |
| Classification: | Noble gas |
| Crystal Structure: | Face center cubic |
| Density | 0.0001784g/mL |
| Color: | Colorless Gas |
| Bonding radius: | 0.98A |
| Atomic radius: | 0.98A |
| Ionization Potential: | 15.759V |
| Electronegativity: | |
| Heat of vaporization: | 6.447kJ/mol |
| Heat of fusion: | 1.188kJ/mol |
| Specific heat: | 0.52J/gK |
| Electron configuration: | [Ne]3s23p6 |
Crystal Structure
| Isotope | Half Life |
| Ar36 | Stable |
| Ar37 | 35days |
| Ar38 | Stable |
| Ar39 | 269 years |
| Ar40 | Stable |
| Ar41 | 1.8 hours |
| Date of Discovery: | 1894 |
| Discoverer: | Sir William Ramsey |
| Uses: | Lighting |
| Obtained From: | air |