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Neon (Ne)

Neon is a chemical element of the periodic table with chemical symbol Ne and atomic number 10 with an atomic weight of 20.1797 u and is classed as noble gas and is part of group 18 (noble gases). Neon is gas at room temperature.

Neon in the periodic table

Atomic number10
Group18 (Noble gases)
ClassificationNoble Gas
AppearanceColorless gas exhibiting an orange-red glow when placed in a high voltage electric field
Color Colorless
Number of protons10 p+
Number of neutrons10 n0
Number of electrons10 e-
From Wikipedia, the free encyclopediaNeon 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.

Physical properties

Phase at STPGas
Density0.9002 g/cm3
Atomic weight20.1797 u

Thermal properties

Melting point24.56 K
-248.59 °C
-415.462 °F
Boiling point27.104 K
-246.046 °C
-410.8828 °F
Heat of vaporization1.77 kJ/mol

Atomic properties

Electronegativity (Pauling Scale)-
Electron affinity-116 kJ/mol
Oxidation states0
Ionization energies
  1. 2080.7 kJ/mol
  2. 3952.3 kJ/mol
  3. 6122 kJ/mol
  4. 9371 kJ/mol
  5. 12177 kJ/mol
  6. 15238 kJ/mol
  7. 19999 kJ/mol
  8. 23069.5 kJ/mol
  9. 115379.5 kJ/mol
  10. 131432 kJ/mol

Electron configuration for neon

Electron configuration
Shorthand configuration
[He] 2s2 2p6
Electron configuration
Full configuration
1s2 2s2 2p6
Electron configuration chart
Electrons per shell2, 8
Valence electrons 8
Valency electrons 0
Bohr model
NeonElectron shell for Neon, created by Injosoft ABNe
Figure: Shell diagram of Neon (Ne) atom.
Orbital Diagram

The history of Neon

PredictionWilliam Ramsay (1897)
Discovery and first isolationWilliam Ramsay, Morris Travers (1898)
Discovery of neon
Neon was discovered in 1898 by the British chemists Sir William Ramsay (1852–1916) and Morris Travers (1872–1961) in London. Neon was discovered when Ramsay chilled a sample of air until it became a liquid, then warmed the liquid and captured the gases as they boiled off. The gases nitrogen, oxygen, and argon had been identified, but the remaining gases were isolated in roughly their order of abundance, in a six-week period beginning at the end of May 1898. First to be identified was krypton. The next, after krypton had been removed, was a gas which gave a brilliant red light under spectroscopic discharge. This gas, identified in June, was named "neon", the Greek analogue of the Latin novum ('new') suggested by Ramsay's son. The characteristic brilliant red-orange color emitted by gaseous neon when excited electrically was noted immediately. Travers later wrote: "the blaze of crimson light from the tube told its own story and was a sight to dwell upon and never forget."


List of unique identifiers for Neon in various chemical registry databases
CAS Number7440-01-9
ChemSpider ID22377
EC number231-110-9
PubChem CID Number23935