10 Ne Neon 20.18
Noble gas
Neon 氖
[He] 2s² 2p⁶
- Period 2
- Group 18
- Block p
- Gas
Electron configuration
1s² 2s² 2p⁶
Orbital diagram (valence)
2s ↑↓
2p ↑↓↑↓↑↓
- Electrons per shell
- 2, 8
- Unpaired electrons
- 0
- Zeff (Slater)
- 5.85
Properties
- Atomic weight
- 20.18
- Electronegativity (Pauling)
- no data
- First ionization energy
- 2081 kJ/mol
- Electron affinity
- no data
- Covalent radius
- 58 pm
- van der Waals radius
- 154 pm
- Melting point
- 24.56 K
- Boiling point
- 27.07 K
- Density
- 8.999 × 10⁻⁴ g/cm³
- Melting / boiling point
- −248.6 °C / −246.1 °C
- Common oxidation states
- 0
- Discovered
- 1898
Natural isotopes
| Mass number A | Abundance |
|---|---|
| 20Ne | 90.48 % |
| 21Ne | 0.2700 % |
| 22Ne | 9.25 % |
Isotope masses: AME2020; abundances: IUPAC/CIAAW representative values.
Emission spectrum
Neon discharge tube · orange-red
Successive ionization energies
The big jumps appear where core electrons start to be removed. Ionization energies from the NIST Atomic Spectra Database.
Neon in the course
The lessons that discuss this element most (ranked by mentions).
Lab experiments with Neon
Periodic trend
Group 18
Data: PubChem periodic table (public domain); atomic weights are IUPAC abridged standard values; covalent radii from Cordero et al. (2008).