0 Inert Gases
| Name | Symbol | Atomic number | Atomic weight | Boiling point | Melting Point | Density |
| Helium | He | 2 | 4.003 | -253 C | -259 C tp | .089 g/cm3(gas) |
| Neon | Ne | 10 | 20.18 | -246 C | -249 C | .90 g/cm3(gas) |
| Argon | Ar | 18 | 39.95 | -186 C | -189 C tp | 1.78 g/cm3(gas) |
| Krypton | Kr | 36 | 83.80 | -153 C | -157 C | 3.73 g/cm3(gas) |
| Xenon | Xe | 54 | 131.3 | -108 C | -112 C tp | 5.89 g/cm3(gas) |
| Radon | Rn | 86 | (222) | -62 C | -71 C | 9.73 g/cm3(gas) |
notes:
The Inert Gases, also known as the Rare Gases or the Noble Gases, are unusual for their great reluctance to react with any other element or compound. Although compounds can now be formed with some of them, it is so difficult that it was once thought impossible.
Helium is often used in welding to protect the hot metal from oxidation.
Radon, a highly radioactive byproduct of the decay of Radium, can accumulate in basements of houses, and extended exposure can cause lung cancer.
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