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Argon

Chemical element
Argon is a chemical element; it has symbol Ar and atomic number 18. It is in group 18 of the periodic table and is a noble gas. Argon is the third most abundant gas in Earth's atmosphere, at 0.934%. Wikipedia
Symbol: Ar
Atomic mass: 39.948 u
Atomic number: 18
Electron configuration: [Ne] 3s² 3p⁶
Boiling point: -302.5°F (-185.8°C)
Melting point: -308.8°F (-189.4°C)