18Ar
Argon
아르곤 · アルゴン
Noble gas
Atomic number18
ElementAr — Argon
Atomic mass39.95
CategoryNoble gas
Group18
Period3
Electron config[Ne] 3s2 3p6
Shells2,8,8
State (RT)Gas
Melting pt-189°C
Boiling pt-186°C
Discovered1894
Main usesWelding shield, light bulbs
2 · 8 · 8