Argon
- Latin name: Argon
- German name: Argon
- Symbol: Ar
- Atomic number: 18
- Period (row): 3
- Group (column): 18
- Element group: noble-gas
- Atomic mass: 39.948
- Discovered in: 1894
The name "argon" is derived from the Greek word ἀργόν, neuter singular form of ἀργός meaning "lazy" or "inactive", as a reference to the fact that the element undergoes almost no chemical reactions.