Argon stops the filament from burning away because it is unreactive.
What is an element?
An element is a substance that cannot be broken down into simpler components by any non-nuclear chemical reaction.
Argon is used in light bulbs. The very thin metal filament inside the bulb would react with oxygen and burn away if the bulb were filled with air instead of argon.
Argon stops the filament from burning away because it is unreactive.
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