| Property | Value |
|---|---|
| Atomic number | 18 |
| Atomic weight | 39.9481 amu |
| Element family | Nobel gases |
| Electronic configuration | 1s2 |
| Stable and very long lived isotopes | 36Ar: 0.337%, 38Ar: 0.063%, 40Ar: 99.600% |
| Previous element | Chlorine |
| Next element | Potassium |
| Density | 0.0017837 g/cm3 (STP) |
| Melting | -189.19 °C |
| Boiling | -185.9 °C |
| Covalent radius | 0.96 Å |
| Van der Waals radius | 1.88 Å |
| First ionization potential | 15.759 eV |
| Electron affinity | -1.000 eV |
| Discovery year | 1894 |
Argon is an element number 18 from nobel gases family. Its symbol is Ar. Argon atomic weight is 39.9481 amu. Ar stable and long lived isotopes are 36Ar: 0.337%, 38Ar: 0.063%, 40Ar: 99.600%. Argon electronic configuration is 1s22s22p63s23p6. Sample compounds that contain Argon are Ar2, N2O2Ar.
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