Skip to content
aidb
argon
Image: Wikimedia Commons

argon

Chemical element with symbol Ar and atomic number 18; rare gas

Chemical elementchemical elementgasatmophile elementQ696

Also known as element 18 · 18Ar

Symbol
Atomic number
  • 18
Mass
Melting point
  • -189.34°C
Boiling point
  • -185.85°C
Discovered by
Discovered
  • 1894

Overview

All data

316 statements · 14% with external sources · numbers in brackets are citations

Speed of sound
Canonical SMILES
Formula
Has characteristic
Standard molar entropy
Dynamic viscosity
  • 22.7 micropascal second temperature: 26.85°C · under pressure: 1 standard atmosphere · state of matter: gas
Unicode character
Part of
Electron configuration
  • 1s² 2s² 2p⁶ 3s² 3p⁶
  • [Ne] 3s² 3p⁶
Subclass of
Named after
Has use
Thermal conductivity
  • 0.01772 watt per metre kelvin
Ionization energy
IPA transcription
Oxidation state
  • 0
Crystal system
Atomic radius
  • 71 picometre
Covalent radius
  • 106 picometre
Van der Waals radius
  • 188 picometre

On other databases

80 identifiers linking argon across the web's reference databases