10
Ne
Neon
20.1797
Neon (Ne)
Noble GasGroup 18Period 2p-block-block
Neon is a chemical element with symbol Ne and atomic number 10. It is in group 18 (noble gases) of the periodic table. Neon is a colorless, odorless, inert monatomic gas under standard conditions, with about two-thirds the density of air.
Latin name: Neon
Atomic Number
10
Atomic Mass
20.1797 g/mol
Phase (STP)
Gas
Electron Config.
[He] 2s² 2p⁶
General
SymbolNe
Atomic Number10
Atomic Mass20.1797 g/mol
CategoryNoble Gas
Group18
Period2
Blockp-block
Electron Configuration[He] 2s² 2p⁶
Valence Electrons8
ColourColorless gas
Appearancecolorless gas exhibiting an orange-red glow when placed in a high voltage electric field
CAS NumberCAS7440-01-9
Physical Properties
Phase (STP)Gas
Density0.0008999 g/cm³
Melting Point-248.59°C · -415.46°F · 24.56 K
Boiling Point-246.08°C · -410.94°F · 27.07 K
Atomic Properties
Atomic Radius38 pm
Covalent Radius58 pm
Van der Waals Radius154 pm
Ionization Energy2081 kJ/mol
Electromagnetic
Electrical TypeInsulator
Abundance
In Universe0.1300%
In Sun0.1000%
In Earth's Crust0.0000003%
In Oceans0.000000012%
In Humans0%
In Meteorites0%
Discovery & History
Discovery Year1898
Discovered ByWilliam Ramsay
Isotopes of Neon
| Isotope | Abundance | Half-life | Decay |
|---|---|---|---|
| Ne-20 | 90.48% | Stable | — |
| Ne-21 | 0.27% | Stable | — |
| Ne-22 | 9.25% | Stable | — |