18
Argon
Atomic Number18
Atomic Mass39.948 u
CategoryNoble Gas
State at Room TempGas
Year Discovered1894
About Argon
The third most abundant gas in Earths atmosphere at 0.93%. Used in welding to protect the weld area from oxidation. Used in incandescent and fluorescent light bulbs. Provides inert atmosphere for growing silicon and germanium crystals. The name means inactive in Greek. Potassium-40 decays into argon-40, used in potassium-argon dating.
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