One of the elements of Earth's periodic table. It has atomic number 18, and is a noble gas. It has the symbol/abbreviation Ar. In normal conditions, it is an invisible gas, but if electricity is passed through it, it will glow pinkish-purple.
See also: List of elements
File:NatCopper.jpg | This article is part of Project Elements, a All Birds project that aims to write comprehensive articles on each element. |