Noble gases of the Periodic Table
The noble gases are the group 18 elements: their outer shell is full, so under normal conditions they are very unreactive. There are 7 elements of this category in the periodic table, from Helium (He), atomic number 2, to Oganesson (Og), atomic number 118.
Noble gases at a glance
- Number of elements: 7
- Phase under standard conditions: Gas 6 elements; Solid 1 elements
Element list
| Atomic no. | Symbol | Name | Atomic mass | Phase | Short configuration |
|---|---|---|---|---|---|
| 2 | He | Helium | 4.0026 | Gas | 1s² |
| 10 | Ne | Neon | 20.18 | Gas | [He] 2s² 2p⁶ |
| 18 | Ar | Argon | 39.95 | Gas | [Ne] 3s² 3p⁶ |
| 36 | Kr | Krypton | 83.798 | Gas | [Ar] 3d¹⁰ 4s² 4p⁶ |
| 54 | Xe | Xenon | 131.29 | Gas | [Kr] 4d¹⁰ 5s² 5p⁶ |
| 86 | Rn | Radon | 222 | Gas | [Xe] 4f¹⁴ 5d¹⁰ 6s² 6p⁶ |
| 118 | Og | Oganesson | 294 | Solid (a theoretical prediction) | [Rn] 5f¹⁴ 6d¹⁰ 7s² 7p⁶ |
Frequently asked questions
Which elements are the noble gases?
The noble gases are Helium, Neon, Argon, Krypton, Xenon, Radon and Oganesson.
How many elements are in the noble gases category?
The periodic table has 7 elements in the noble gases category.