Noble Gas
6 elementsInert gases in Group 18 with full valence shells. They have very low reactivity due to their stable electron configurations. Noble gases are colorless, odorless, and monatomic, with very low boiling points.
2
Gas
He
Helium
4.0026 u
MP: -272.2 °C
BP: -268.9 °C
10
Gas
Ne
Neon
20.18 u
MP: -248.6 °C
BP: -246.0 °C
18
Gas
Ar
Argon
39.948 u
MP: -189.3 °C
BP: -185.8 °C
36
Gas
Kr
Krypton
83.798 u
MP: -157.4 °C
BP: -153.2 °C
54
Gas
Xe
Xenon
131.29 u
MP: —
BP: —
86
Gas
Rn
Radon
222.0 u
MP: —
BP: —
Comparison Table
| # | Symbol | Name | Mass (u) | Melting Pt | Boiling Pt | Density | Phase |
|---|---|---|---|---|---|---|---|
| 2 | He | Helium | 4.0026 | -272.2 °C | -268.9 °C | 0.0001785 | Gas |
| 10 | Ne | Neon | 20.18 | -248.6 °C | -246.0 °C | 0.0008999 | Gas |
| 18 | Ar | Argon | 39.948 | -189.3 °C | -185.8 °C | 0.0017837 | Gas |
| 36 | Kr | Krypton | 83.798 | -157.4 °C | -153.2 °C | 0.003749 | Gas |
| 54 | Xe | Xenon | 131.29 | — | — | — | Gas |
| 86 | Rn | Radon | 222.0 | — | — | — | Gas |