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.
Three reasons Neon stands out
1
Produces a distinctive red-orange glow.
2
It is the fifth most abundant element in the entire universe.
3
Despite its fame in signs, it was only discovered on Earth in 1898.
The true color of a neon sign
Excited neon atoms emit an unmistakable red-orange light. Many signs casually called “neon” use other gases or phosphor coatings for different colors, but genuine neon needs no such disguise. The element was separated from liquefied air in 1898, revealing a rare earthly gas with a bright electrical signature.
Recognizing Neon in Elementle
If Neon is the mystery element, guesses below atomic number 10 point up and guesses above it point down. Its symbol is Ne: a green letter matches the same position in that symbol, while a yellow letter belongs in another position.
The family clue turns green for noble gas guesses. Compare Helium (He), number 2 and Argon (Ar), number 18: they share the family clue, but their atomic numbers and symbols help you tell them apart.
Values are reference data, not a specification for every temperature, pressure, or allotrope. Unknown properties are left unavailable. Superheavy-element predictions remain uncertain.
The introduction and original editorial story are adapted from Wikipedia contributors via Periodic-Table-JSON. Element descriptions and their adaptations are available under CC BY-SA 3.0. Numerical attributes use the PubChem periodic-table dataset, retrieved September 22, 2026.