Group 0

• Noble gases = group 0 elements - full outer shell so unreactive
• noble gasses = full outer shell = inert/unreactive
• helium = fill ballons (lighter than air)
• Neon = Lighting for shop signs = emits a red light when electricity passes through it
• Argon = Light bulbs (prevents metal filament - old-fashioned - from burning) and welding (prevents metals from reacting with oxygen)