Argon
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Element
Name: Argon
Symbol: Ar
Atomic Number: 18
Atomic Mass: 39.9 amu
Number of electrons: 18
Classification: Non-metal
Crystal structure: Cubic
Color: Colorless gas
Date of Discovery: 1894
Name of Discoverer: Sir William Ramsey
Name Origin: From the Greek argon.
Uses: Lighting
Obtained from: Air