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Reference
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Noble (Inert) Gases
Radioactive Natural Element | 
Radioactive Synthetic Element | 
Toxic Element |
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| Group 18 of the Periodic Table |
| Name | Sym. | No. | Atomic
Weight | Melting
Point | Boiling
Point | Phase | Density | Valence
Electrons | Oxidation
States |
| Helium | He | 2 | 4.002602 | -272.2 °C | -268.93 °C | Gas | 0.1786 g/L | 1s2 | 0 |
| Neon | Ne | 10 | 20.1797 | -248.59 °C | -246.08 °C | Gas | 0.9002 g/L | 2s22p6 | 0 |
| Argon | Ar | 18 | 39.948 | -189.35 °C | -185.85 °C | Gas | 1.784 g/L | 3s23p6 | 0 |
| Krypton | Kr | 36 | 83.798 | -157.36 °C | -153.22 °C | Gas | 3.749 g/L | 4s24p6 | +2 |
| Xenon | Xe | 54 | 131.293 | -111.7 °C | -108.12 °C | Gas | 5.894 g/L | 5s25p6 | 0 |
| Radon | Rn | 86 | 222 | -71.15 °C | -61.85 °C | Gas | 9.73 g/L | 6s26p6 | 0 |
| Ununoctium | Uuo | 118 | 294 | Unknown | Unknown | Gas | Unknown | 7s27p6 | ? 0 |
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Noble Gases: Group 18 of the periodic table, the most stable due to having the maximum number of valence electrons their outer shell can hold, rarely react with other elements; conduct electricity, odorless, colorless, and are used in many conditions when a stable element is needed to maintain a safe and constant environment.
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Chemistry Quick Facts