Argon is an inert gas that makes up nearly one percent of Earth's atmosphere and shields materials from reactive air.
Atomic number
18
Category
Noble gas
Period
3
Group
18
State
Gas
Fun facts about Argon
Its name reflects its chemical inactivity.
Argon is more abundant in air than carbon dioxide.
It produces a lilac-violet glow in a discharge tube.
Common uses of Argon
Shielding gas for welding
Inert lamp filling
Protective atmospheres for manufacturing
Where Argon sits in the periodic table
Argon is classified as a noble gas in period 3 and group 18 of the periodic table. Under the conditions represented in this reference, its state is gas.
Quick chemistry revision
For quick revision, pair the symbol Ar with atomic number 18 and the listed atomic mass 39.948. The summary, facts, and uses above keep those element properties together in one reference.