Ne
Neon
Neon is a chemical element with the symbol Ne and atomic number 10. It has a standard atomic weight of 20.18, sits in period 2 and group 18, and is classified as a noble gas.
Properties
| Symbol | Ne |
|---|---|
| Atomic number | 10 |
| Standard atomic weight | 20.18 |
| Category | Noble gas |
| Group | 18 |
| Period | 2 |
| Electron configuration | [He] 2s2 2p6 |
| Outer-shell electrons | 8 |
The figure of 20.18 is a standard atomic weight.
Calculate with neon
- Molar mass of any formula containing it
- Electron configuration, including ions
- Effective nuclear charge by Slater's rules
- Average atomic mass from isotope abundances
Group 18
Atomic weights are the IUPAC 2021 standard values, abridged to the conventional five significant figures. Group, period, category and electron configuration are derived from the atomic number rather than stored, so they cannot drift out of step with it.