Element 10
Neon (Ne)
Neon (Ne) is element 10 of the periodic table, a noble gas in period 2, group 18 (p-block) with an atomic mass of 20.18 and is a gas at standard conditions.
At a glance
- Atomic number
- 10
- Symbol
- Ne
- Atomic mass
- 20.18 u
- Category
- Noble gases
- Period
- 2
- Group
- 18
- Block
- p-block
- Phase at STP
- gas
Electron structure
- Electron configuration
- 1s2 2s2 2p6
- Shorthand configuration
- [He] 2s2 2p6
- Electrons per shell
- 2, 8
- Oxidation states
- 0
Physical properties
- Melting point
- 24.56 K
- Boiling point
- 27.07 K
- Density
- 0.0008999 g/cm3
- Phase
- gas
Atomic properties
- Atomic radius
- 38 pm
- Covalent radius
- 58 pm
- Van der Waals radius
- 154 pm
- First ionization energy
- 2081 kJ/mol
- Electron affinity
- 0 kJ/mol
Notable isotopes
| Isotope | Mass | Abundance | Stability |
|---|---|---|---|
| Ne-20 | 19.99244 | 90.48% | Stable |
Common uses
- Neon signs
- Lasers
- Cryogenics
- High-voltage indicators
Discovery
- Year
- 1898
- Discovered by
- William Ramsay, Morris Travers
- Country
- England