Gaseous elements
Eleven elements are gases at room temperature and atmospheric pressure: hydrogen, nitrogen, oxygen, fluorine, chlorine and the six noble gases (helium, neon, argon, krypton, xenon, radon).
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| No. | Symbol | Element | Atomic weight (u) | Density (g/cm³) | Melting point (K) | Boiling point (K) | Electronegativity | Discovered |
|---|---|---|---|---|---|---|---|---|
| 1 | H | Hydrogen | 1.0079 | 0.08988 | 13.99 | 20.271 | 2.2 | 1766 |
| 2 | He | Helium | 4.0026 | 0.1786 | 0.95 | 4.222 | - | 1868 |
| 7 | N | Nitrogen | 14.0064 | 1.251 | 63.15 | 77.355 | 3.04 | 1772 |
| 8 | O | Oxygen | 15.999 | 1.429 | 54.36 | 90.188 | 3.44 | 1774 |
| 9 | F | Fluorine | 18.9984 | 1.696 | 53.48 | 85.03 | 3.98 | 1810 |
| 10 | Ne | Neon | 20.1797 | 0.9002 | 24.56 | 27.104 | - | 1898 |
| 17 | Cl | Chlorine | 35.446 | 3.2 | 171.6 | 239.11 | 3.16 | 1774 |
| 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 |
| 112 | Cn | Copernicium | 285 | 23.7 | - | 3570 | - | 1996 |