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Ar
Argon
Atomic Z: 18 · Mass A: 40
Proton (p⁺)
Neutron (n⁰)
Electron (e⁻)
Ar
Argon
Z = 18
Mass A = 40 u · Noble Gas
Protons (p⁺)
18 Neutrons (n⁰)
22 Electrons (e⁻)
18 Orbit Velocity1.0x
Orbit Rings
Nucleus Glow
Select Element (29)
Scientific Summary
Third most abundant gas in Earth’s atmosphere (0.93%), completely unreactive noble gas with filled octet.
Did You Know?
Double-pane energy efficient windows are filled with inert argon gas to block thermal transfer!
Practical Applications
Incandescent Light Bulbs
TIG Arc Welding Shielding
Double-Pane Windows
Document Preservation
Discovered By: Lord Rayleigh & William RamsayYear: 1894