
Group 18 elements
Group 18 of the periodic table contains these elements: Helium, Neon, Argon, Krypton, Xenon, Radon, Oganesson.
Browse by
| No. | Symbol | Element | Atomic weight (u) | Density (g/cm³) | Melting point (K) | Boiling point (K) | Electronegativity | Discovered |
|---|---|---|---|---|---|---|---|---|
| 2 | He | Helium | 4.0026 | 0.1786 | 0.95 | 4.222 | - | 1868 |
| 10 | Ne | Neon | 20.1797 | 0.9002 | 24.56 | 27.104 | - | 1898 |
| 18 | Ar | Argon | 39.792 | 1.784 | 83.81 | 87.302 | - | 1894 |
| 36 | Kr | Krypton | 83.7982 | 3.749 | 115.78 | 119.93 | 3 | 1898 |
| 54 | Xe | Xenon | 131.294 | 5.894 | 161.4 | 165.051 | 2.6 | 1898 |
| 86 | Rn | Radon | 222 | 9.73 | 202 | 211.5 | 2.2 | 1899 |
| 118 | Og | Oganesson | 294 | 4.95 | - | 350 | - | 2002 |