Ar

Argon

Atomic Number 18 · Gas ampule

The third most abundant gas in Earth's atmosphere. Used as an inert shielding gas in welding and lightbulbs.

Atomic Mass

39.948 u

Category

Noble Gas

Phase (STP)

Gas

Density

0.0017837 g/cm³

Melting Point

-189.34 °C

Boiling Point

-185.85 °C

Atomic Radius

71 pm

Electron Configuration

[Ne] 3s2 3p6

Discovered

1894 — Lord Rayleigh

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Sample form: Gas ampule

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