Bryan McAllister’s personal reference notebook
September 12, 2026Short & citedBlog
Civic Viewpoint.
A quiet encyclopedia with a personal desk
Kept by Bryan McAllister — short guides, clear facts, and the Canadian angle when it matters.
Field Notes • Chemistry

Neon

Neon is a chemical element with symbol Ne and atomic number 10.

Updated September 12, 20261 min readCited sources

Neon is a noble gas with atomic number 10, known for its bright reddish-orange glow in electric signs. It is colourless, odourless, and chemically inert under normal conditions.

What it is

Neon (symbol Ne) is a Group 18 noble gas, one of the least reactive elements. It is monatomic at room temperature and does not form strongly bound neutral molecules. Its atomic mass is 20.1797 u.

Why it matters

Neon is best known for its use in illuminated signs and vacuum discharge tubes, where it emits a characteristic red-orange glow. It is also used as a cryogenic refrigerant in some laboratory and industrial applications.

Key details

Discovered in 1898 by William Ramsay and Morris W. Travers, neon occurs only in trace amounts in Earth’s atmosphere. It is much more abundant in the universe. The name comes from the Greek word for 'new'.

In short

  • Neon is a noble gas with atomic number 10.
  • It glows reddish-orange in electric signs.
  • It is chemically inert under normal conditions.
  • Discovered in 1898 by Ramsay and Travers.

Quick questions

What is neon?
Neon is a chemical element, a noble gas in Group 18 with atomic number 10.
Why does neon glow in signs?
When electricity passes through neon gas in a tube, it emits a characteristic reddish-orange light.
Is neon reactive?
Neon is chemically inert under normal conditions and rarely forms stable compounds.

Sources

  1. Encyclopaedia Britannica — https://www.britannica.com/science/neon-chemical-element
    Supports: Neon as a noble gas, its properties, and use in electric signs and fluorescent lamps.
  2. Royal Society of Chemistry — https://edu.rsc.org/elements/neon/2020018.article
    Supports: Atomic number, atomic mass, group, abundance in Earth’s atmosphere, and general properties.
  3. NIH PubChem — https://pubchem.ncbi.nlm.nih.gov/compound/Neon
    Supports: Colourless, odourless, noncombustible, chemically inert gas and principal uses.
  4. Wikipedia — https://en.wikipedia.org/wiki/Neon
    Supports: First p-block noble gas, true octet, and lack of strongly bound neutral neon molecules.
  5. American Chemical Society — https://www.acs.org/molecule-of-the-week/archive/n/neon.html
    Supports: Neon as an unbonded atom, its abundance in the universe, and atmospheric concentration.
  6. American Elements — https://www.americanelements.com/ne.html
    Supports: Discovery in 1898, symbol Ne, atomic number 10, and production from liquefied air.